I hear you about difference between verbal and online communication.

The specific point I made above was regarding in-person communication. I hope I made clear that community hazards can be talked about, but carefully, in those settings, depending on the skill levels of the people involved in rational communication.

Regarding online communication, I generally see it as quite fine to talk about a potentially triggering topic on LW, as long as the article is clearly labeled as such, and people can choose not to click on it. There are exceptions where talking about a topic takes down Chesterton's fences, such as PUA, etc., but the suggestions I made above don't apply to them so much.