Because he want to retire and cash out his equity after vesting in, so he hypes the power of AI out the door and dumps his options.

Your guess is as good as mine. There's lots of people working in industries that are actively killing us. The whole "no ethical consumption" bit extends pretty far. When you're poor it's acceptable to do "the best you can". As your economic standing grows/when you're rich, there are diminishing returns on how much sympathy society will give you over what they view as choosing to destroy the planet or humanity or whatever.

The view is that if you have money you can do something about it.

So maybe some of them think they are helping. Maybe some of them view it as a damned if I do damned if I don't type scenario. Maybe some of them think that the money will help them in the future that is coming.