Just to be clear it is not a view that I hold. But many people on the "TRA side" spread the narrative that GC people are actively and deliberately harming tran people. Have you really never come accross this?
I have come across people saying it, but usually in a hyperbolic way - I have never heard the logical argument on which it's based and to be honest, I had assumed that was because there wasn't one and it was just a way of shutting down gender critical views. I got all excited because I thought you might be able to explain what people meant by that, but I guess we're none the wiser!
I appreciate that it's hard for you to explain that view if you don't hold it yourself and have just heard other people saying it, but I think that similarly, if you can't explain a view, it can be unhelpful to frame it as "the extreme end of gender critical thinking" as it seems from what you've said that you're basing that description on a strawman idea of what some TRAs believe gender critical views are.
I appreciate that you were trying to illustrate the two extremes of thinking on this, but it seems that you were doing so from the particular perspective of what gender identity ideologues believe those two extremes to be.
It comes across as a biased comment because "gender critical beliefs as necessarily wishing harm on trans people" were set as one extreme, which would be a very extreme and bizarre view if anyone actually held it, with the belief that biological males who identify as transwomen should be allowed to participate in women's sports at the other.
Since these are both beliefs from the perspective of gender identity ideology (since the first one grossly misrepresents the gender critical view and the other one (on participation in women's sports) is relatively mainstream and uncontroversial among gender identity ideologues), framing these as the two extremes suggests that gender critical views are far more extreme than the apparently more moderate position that gender identity ideologues take.
I do absolutely understand how hard it is to try to appreciate both sides of all of this and to then get grief from absolutely everyone for trying to acknowledge and respect everyone's views while simultaneously grappling with one's own thoughts on the matter, and I've been there myself!
Some wise MNer told me several years ago that it's not possible to sit on the fence forever on this issue (which isn't what I thought I was doing at all at the time), but I see now that they were absolutely right.
Believing in gender identity ideology while also not believing in it isn't logically possible, and the two views will come into conflict in everyone's life at some point. Eventually, we're all forced to confront the question and pick a lane, and there's no avoiding that. It's not like being an agnostic in terms of religion and simply not going looking for answers and getting on with life, because the question comes to you. This idea of gender identity is so pervasive now that everyone is going to be faced with deciding what they actually believe eventually, and logically, it can't be both.