At a Tuesday rally, Donald Trump said something that could easily be interpreted as a call for violence against a future Clinton administration.

"Hillary wants to abolish, essentially abolish the Second Amendment," Trump said. "By the way, and if she gets to pick — if she gets to pick her judges, nothing you can do, folks. Although the Second Amendment people, maybe there is, I don’t know."

As is common with Trump, it’s unclear exactly what he’s saying — whether it’s a call for assassination, armed insurrection, or something else entirely. But one thing that people have debated a lot after the comment is whether it was a "joke" or meant seriously.

But in a certain sense, it doesn’t really matter what Trump intended. This tweetstorm, from Dallas lawyer Jason P. Steed, explains why.

Before becoming a lawyer, Steed was an English professor. He wrote his PhD dissertation on "the social function of humor" and found something important: Jokes about socially unacceptable things aren’t just "jokes." They serve a function of normalizing that unacceptable thing, of telling the people who agree with you that, yes, this is an okay thing to talk about.

This, Steed explains, is why "it’s a joke" isn’t a good defense of racist jokes. By telling the joke, the person is signaling that they think racism is an appropriate thing to express. "Just joking" is just what someone says to the people who don’t appreciate hearing racist stuff — it shouldn’t matter any more than saying "no offense" after saying something offensive.

Likewise, Trump is signaling that assassinating Hillary Clinton and/or her Supreme Court nominees is an okay thing to talk about. He’s normalizing the unacceptable.

1. I wrote my PhD dissertation on the social function of humor (in literature & film) and here's the thing about "just joking." — Jason P. Steed (@5thCircAppeals) August 9, 2016

2. You're never "just joking." Nobody is ever "just joking." Humor is a social act that performs a social function (always). — Jason P. Steed (@5thCircAppeals) August 9, 2016

3. To say humor is social act is to say it is always in social context; we don't joke alone. Humor is a way we relate/interact with others. — Jason P. Steed (@5thCircAppeals) August 9, 2016

4. Which is to say, humor is a way we construct identity - who we are in relation to others. We use humor to form groups... — Jason P. Steed (@5thCircAppeals) August 9, 2016

5. ...and to find our individual place in or out of those groups. In short, joking/humor is one tool by which we assimilate or alienate. — Jason P. Steed (@5thCircAppeals) August 9, 2016

6. IOW, we use humor to bring people into - or keep them out of - our social groups. This is what humor *does.* What it's for. — Jason P. Steed (@5thCircAppeals) August 9, 2016

7. Consequently, how we use humor is tied up with ethics - who do we embrace, who do we shun, and how/why? — Jason P. Steed (@5thCircAppeals) August 9, 2016

8. And the assimilating/alienating function of humor works not only only people but also on *ideas.* This is important. — Jason P. Steed (@5thCircAppeals) August 9, 2016

9. This is why, e.g., racist "jokes" are bad. Not just because they serve to alienate certain people, but also because... — Jason P. Steed (@5thCircAppeals) August 9, 2016

10. ...they serve to assimilate the idea of racism (the idea of alienating people based on their race). And so we come to Trump. — Jason P. Steed (@5thCircAppeals) August 9, 2016

11. A racist joke sends a message to the in-group that racism is acceptable. (If you don't find it acceptable, you're in the out-group.) — Jason P. Steed (@5thCircAppeals) August 9, 2016

12. The racist joke teller might say "just joking" - but this is a *defense* to the out-group. He doesn't have to say this to the in-group. — Jason P. Steed (@5thCircAppeals) August 9, 2016

13. This is why we're never "just joking." To the in-group, no defense of the joke is needed; the idea conveyed is accepted/acceptable. — Jason P. Steed (@5thCircAppeals) August 9, 2016

14. So, when Trump jokes about assassination or armed revolt, he's asking the in-group to assimilate/accept that idea. That's what jokes do. — Jason P. Steed (@5thCircAppeals) August 9, 2016

15. And when he says "just joking," that's a defense offered to the out-group who was never meant to assimilate the idea in the first place. — Jason P. Steed (@5thCircAppeals) August 9, 2016

16. Indeed, circling back to the start, the joke *itself* is a way to define in-group and out-group, through assimilation & alienation. — Jason P. Steed (@5thCircAppeals) August 9, 2016

17. If you're willing to accept "just joking" as defense, you're willing to enter in-group where idea conveyed by the joke is acceptable. — Jason P. Steed (@5thCircAppeals) August 9, 2016

18. IOW, if "just joking" excuses racist jokes, then in-group has accepted idea of racism as part of being in-group. — Jason P. Steed (@5thCircAppeals) August 9, 2016

19. Same goes for "jokes" about armed revolt or assassinating Hillary Clinton. They cannot be accepted as "just joking." — Jason P. Steed (@5thCircAppeals) August 9, 2016

20. Now, a big caveat: humor (like all language) is complicated and always a matter of interpretation. For example, we might have... — Jason P. Steed (@5thCircAppeals) August 9, 2016

21. ...racist humor that is, in fact, designed to alienate (rather than assimilate) the idea of racism. (Think satire or parody.) — Jason P. Steed (@5thCircAppeals) August 9, 2016

22. But I think it's pretty clear Trump was not engaging in some complex satirical form of humor. He was "just joking." In the worst sense. — Jason P. Steed (@5thCircAppeals) August 9, 2016

23. Bottom line: don't accept "just joking" as excuse for what Trump said today. The in-group for that joke should be tiny. Like his hands. — Jason P. Steed (@5thCircAppeals) August 9, 2016

This is a broader problem with Trump’s candidacy. Even if he never makes it into the White House, it’s not clear how much damage his penchant for shattering norms against explicit racism and calls for violence is doing to American politics.

Other candidates have made comments similar to Trump’s — see 2010 Nevada Senate candidate Sharron Angle’s "Second Amendment remedies" line, among others. The difference here is that Trump is a major party standard-bearer, and so has a great deal more power to normalize the unacceptable. What he says matters a lot — even when he’s "joking."

Watch: This election is about normal vs. abnormal