This gave me an idea. Maybe you're right about this and he does know someone IRL that needs a conversation real bad right now. I can think of one in my life straight away. I'm 99% sure she's deeply depressed and likely suicidal. But outside asking how she's doing and if she's OK, what's on her mind, etc., I have no idea how to even broach the subject and despite numerous attempts it always goes nowhere.
Now how can I send a message to her that I think might mean something coming from me, that I can't send privately without making a potentially false assumption that she's suicidal? Maybe I can just send it generically to everyone - there's a million virtue signalling posts of the same ilk going around so most people won't even blink but maybe she sees it and it means something to her. If not the suicide hotline, maybe she opens up to me and who knows if we can help? And if not, what's the downside?
I mean it's probably not that, in fact it's a long shot, but your comment made me think there could be more to it than delusional virtue signalling so I'd best not judge too harshly like I was tempted to. I think as a generic post to everyone it's likely meaningless but there could be more to it. Even if not designed for a very specific target audience, it could just be a conversation starter where people feel comfortable talking about it semi-anonymously. Who knows.