> the difference here is that your example is lukewarm extremist content at best
That is "a" difference, not the difference
> This kind of content paints wild ideas but does not contest reality
It describes reality in ways that are not actually true.
> or directly incite weird actions.
You do not know the direct or indirect consequences of such content. Understanding causation in a complex, chaotic system is far beyond the cognitive capabilities of the human mind. To make it even worse, the mind typically (and incorrectly) perceives itself to be capable of such calculations.
> Here's some examples of what I mean
I belong to a wide variety of communities - I could also provide similar examples of silly thinking from those who fall into various categorizations. I don't disagree that the "far right" types may indeed pose greater risk (but to be clear: whether that is actually true, is unknown, and a body count perspective strongly suggests otherwise [1]), but to speak as if they are the only risk worth worrying about is itself contesting reality.
Reality is infinitely complex, but the conscious mind does not perceive it this way. Even worse, it (the mind, which is in ultimate control of each comment posted on forums like this) seems to refuse to even consider (almost without exception) that it is infinitely complex. I believe that this may be much more dangerous than it may appear (to the mind...which may happen to be just a little biased on the subject).
[1] Here I refer to war, in general, which is not the fault of "the far right", who seem to very conveniently get all the media attention.