If I were to expand this post at a future time, which ideas specifically do you find enlightening / would you say should be expanded? Are there any portions that you think should be slimmed or removed altogether?

What I think LW could benefit from is an explanation "from the inside" of what leads some people of disprivileged groups to be sensitive to the expression of certain opinions, to ask for "safe spaces" and talk of "triggers", et cetera. I think you have an evenhanded position that on one side does not ask LW to censor or discourage dispassionate discussions of these opinions, but at the same time enables those who profess them to understand the unintended effects their words can have. Thus the well-intentioned among them (and I am sure there are some, though I share your indignation at those who are not and use underhanded tactics like mass-downvoting) will hopefully be more cautious in their choice of words, and also perhaps realize that requests for "safe spaces" are not necessarily power plays to squash controversy.

I think the last paragraph (except for the first sentence) is the part that could be slimmed or removed; you have registered your protest against mass downvoting and doing it again in a post would distract from the main topic.

Another thing to think about is how to talk about this productively without triggering similar over-heating

Indeed, writing a top-level post about this in a way that does not cause a flamewar is a daunting, perhaps impossible task. I fully understand if under consideration you prefer not to do it.