There's a lot to nitpick here but I guess the most interesting thing to me is that, for all their wealth, access and smarts, none of these people seem to actually be trying to solve the systematic and endemic problems which would soften the blow of a major existential risk.
When the best and brightest of a society are heading for the hills, that's a sign problems are coming. It's not that just they may have concrete reasons to do this but it seems like the society itself by this fact has lost the cohesion that would prevent disaster. And if powerful people don't imagine themselves are the protectors of the common good, who does? etc.
Of course, this situation is a bit of a self-fulling prophecy.