Meghan Murphy is a Vancouver writer and journalist and founder of the website Feminist Current.

Talk about "safe spaces" has been spreading amid a high-profile series of incidents at universities in North America and Europe, leading many to argue that today's students need to develop thicker skins. These debate-free zones are presented as a way of protecting individuals from potentially traumatic experiences, but the reality is much more pernicious – and the issue extends far beyond campus politics.

We're not talking here about the kinds of private spaces that allow individuals to organize, heal or meet among themselves on their own terms. Female victims of rape and abuse, for example, need access to "safe spaces" that are free from men and abusers. People of colour should have every right to meet privately among themselves. These are basic tenets that marginalized groups ascribe to when struggling against systems of power. But these are limited, designated spaces – it's another thing altogether to appropriate wider public places or events, college campuses and public social-media forums, such as Twitter.

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As a feminist, I understand that ideas and words are not harmless. But the recent pushback hasn't targeted people pushing racist or misogynist doctrine. Instead, people are arguing that the very act of questioning positions they consider to be "right" constitutes hate speech. Academics and journalists, even ones who are advancing long-standing feminist and anti-imperialist arguments, are finding themselves blacklisted because their ideas challenge a liberal status quo.

There are a number of recent examples from the prostitution debate alone:

English journalist Julie Bindel was removed from a London panel discussing a documentary about a prostitution survivor because of protests by groups that want to legalize the sex industry. (Ms. Bindel advocates for the Nordic model of law, recently adopted in Canada but opposed by many mainstream feminists.)

After Pulitzer-winning journalist Chris Hedges wrote an article condemning the sex industry as “the quintessential expression of global capitalism,” the organizer of a Vancouver conference about “resource capitalism” was threatened with a boycott if the journalist’s keynote speech – scheduled for delivery Friday night – was allowed to proceed.

Feminist comedian Kate Smurthwaite’s show at Goldsmiths, University of London, was cancelled last month due to complaints about her position on prostitution. Ironically, it was free speech, not prostitution, that was to have been the focus of her show.

The Cambridge Union was asked to withdraw its speaking invitation to feminist icon Germaine Greer, who was accused of “hate speech” because she said she wasn’t sure she believed transphobia was a thing.

It's not just campuses, though, where people are using the "safe space" concept to silence those they disagree with. The Block Bot is an online incarnation of "safe space" – it's a website whose service aims to protect Twitter users from "trolls, abusers and bigots." Put aside the point that any Twitter user can already block anyone they wish at any given time – the way the application has been put into effect shows that its professed purpose does not match its actual impact.

Rather than weeding out users who aim to harass or threaten, the application seeks to compile a list of political dissidents, labelling users who step out of line with a variety of slurs. I myself was added to "Level 2" for expressing polite disappointment that a sexual-assault centre had taken a position in favour of decriminalizing the purchase of sex.

Thousands of others, including noteworthies such as New Statesman deputy editor Helen Lewis, physicist Brian Cox, evolutionary biologist Richard Dawkins and feminist activist Caroline Criado-Perez, are listed on the Block Bot – guilty not of trolling, harassing or abusing but of having opinions "blockers" disagree with. The entire site, as a result, has recently faced libel warnings.

What's troubling about efforts to silence those whose beliefs we find distasteful is not just the implications of censorship and libel, but the dishonesty of it all.

Claims that particular conversations or debates will cause us to "feel unsafe" are, in these contexts, little more than an excuse to shut down dissenting points of view. It puts those dissenters in the awkward position of having to dispute their accuser's mental stability or claims of emotional trauma instead of allowing them to respond to the real issue: political disagreement. You can argue with someone who says "I want to ban this particular speaker from a panel because I disagree with her position," but it's more difficult to challenge someone who says "This person makes me feel unsafe."

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Pathologizing disagreement is an intellectually dishonest way to cope with challenging arguments. It certainly doesn't support critical thinking.

It also creates a culture wherein people are afraid to express dissenting opinions or question the party line. This is ironic, because many of those under threat of being silenced are people who are speaking out against abuse, harassment and violence. While some may hold "controversial" opinions about how best to do it, they are just that – controversial. Throughout history, our heroes and radicals have held controversial opinions. How often do tepid opinions and fearfulness change the world for the better?

It's time proponents of this kind of "safe space" start being forthright in their accusations. It's okay to disagree, but not to frame differences of opinion as abuse. Those working to silence the disagreeable might imagine the day they question peers themselves, then ask whether they are prepared to choose between silence or blacklisting.