What did you all do in the past hour or so? LOL!
I think it's just the internet culture catching up with itself among certain people.
I think it's something akin to unspoken but agreed upon group delusion; wonder if there's a word for that. Whenever someone or people nonchalantly chat in manner that's uncalled for for the situation, I think (I hope?) we all know they're either just trying to mask their insecurities or they just want attention.
And they'd get it, by passing around nonsense posts until the thread gets nuked. Those posts fulfill both the need for attention and also as the metaphorical "hey look at me, I'm not mad" sign on their back.