Honestly I don’t really see the point in extrapolating to other words, or quibbling over the poster’s intentions in drawing attention to this one, or arguing about how sensitive or unsensitive hypothetical people should be.
To me it’s just:
I see the logic for how for this word in particular could be sensitive, and how that could potentially outweigh its educational value in being in Wanikani. No more than that.
I find SRS a comforting ritual each morning, and I can see how if I were suffering from suicidal ideation, this word in particular could jeopardize that feeling in a way that other words don’t, and how therefore it’s an identifiable edge case in what words to include or exclude.
Like, I have no personal preference, but the line of thought holds more water to me as an argument for removing a word than “it’s useless.” (because personally I think even slight usefulness is worthwhile, and even slight/rare negative impact on real humans is bad)
I’m not surprised that if threads about “this word is useless” generally devolves into a long thread of people’s perspectives not quite gelling with each other, that this one about an even more emotionally fraught one would do the same, but I don’t think it actually needs to be about anything more than about if this specific word fits or doesn’t fit.
So, my answer is it’s up to the Wanikani team where to draw the line.
They should take the thread as “hey maybe this one item should be outside the line” and nothing more.