Sure, but it's also got a great deal to do with political identity and group signalling.
In the modern age (and forever, probably, but more quietly / less permanently), we are defined by what we're outraged by.
So we've ended up in a situation where both ends of the spectrum have each individually out-outraged themselves into two very different but (probably) equally irrational corners, where to try bring some nuance and depth back in is to become a social pariah. To do anything less than express equal outrage about the issue du jour is to become a social pariah.
Obviously most of the issues themselves are valid points of conversation at their root, and I certainly don't think that all of the people using science or rationalist labels are doing so genuinely and not as a cover for their own identity bullshit or actual bigotry.
But that's orthogonal to the observation that it seems true that we simply can't have a conversation anymore about certain trigger topics. Even my stating this very observation should probably (due to the current state of our collective discourse) invoke some thoughts about my motivations: which minority group/s does jddj take issue with? Is he transphobic? He mustn't realise how much of the repression of women has simply been normalised for him.
Whether it's a symptom or a standalone issue isn't really important. The point is that it's not useful as a tool for beneficial societal change, instead it's a tool for gesturing vaguely and it's a crutch that we lean on so as to not need to truly engage with or wade into the uncomfortably nuanced grey areas which naturally surround every issue.
But on the left we've absolutely embraced it, to a fault. Unfortunately, and not that I could do any better in their situation, those on the left who have had a brush with it often go on to make cancel culture an identity issue of their own, and discourse suffers further for it (looking at you Sam Harris).
Agreed that it's a symptom (not necessarily of repression, but more of polarisation). I don't agree that that characterisation is enough to get it a free pass.