What makes it possible for someone like Trump to attain power and hold it is the acquiescence of people, both voters and politicians, who aren’t white supremacists, who sort-of kind-of believe in the rule of law, but are willing to go along with racists and lawbreakers if it seems to serve their interests.

There have been endless reports about the low-education white voters who went overwhelmingly for Trump last November. But he wouldn’t have made it over the top without millions of votes from well-educated Republicans who — despite the media’s orgy of false equivalence or worse (emails!) — had no excuse for not realizing what kind of man he was. For whatever reason, be it political tribalism or the desire for lower taxes, they voted for him anyway.

Given the powers we grant to the president, who in some ways is almost like an elected dictator, giving the office to someone likely to abuse that power invites catastrophe. The only real check comes from Congress, which retains the power to impeach; even the potential for impeachment can constrain a bad president. But Republicans control Congress; how many of them besides John McCain have offered full-throated denunciations of the Arpaio pardon?

The answer is, very few. Paul Ryan, the speaker of the House, had a spokesman declare that he “does not agree with this decision” — not exactly a ringing statement. Yet Ryan did better than most of his colleagues, who have said nothing at all.

This bodes ill if, as seems all too likely, the Arpaio pardon is only the beginning: We may well be in the early stages of a constitutional crisis. Does anyone consider it unthinkable that Trump will fire Robert Mueller, and try to shut down investigations into his personal and political links to Russia? Does anyone have confidence that Republicans in Congress will do anything more than express mild disagreement with his actions if he does?

As I said, there’s a word for people who round up members of ethnic minorities and send them to concentration camps, or praise such actions. There’s also a word for people who, out of cowardice or self-interest, go along with such abuses: collaborators. How many such collaborators will there be? I’m afraid we’ll soon find out.