Look at history of nuclear, biological, and chemical weapons.

What particular event are you talking about. I know of no time that somebody created a weapon of mass destruction and then set it off with them standing right next to it.

I feel like you’ve probably missed my point, they say AI will destroy the entire human race which presumably they are part of, which means they are claiming to be creating the means for their own demise as well. No one would do that. Which means either they’re insane, which is possible but the most likely answer is that they are lying.