That's why they have no reason to care, but it's not a reason why they're actively working against humanity. They're hopefully not planning to bequeath their wealth, because of, you know, the whole destroying-the-planet thing.
So, once they're rich enough to live the rest of their lives in prosperity, just like, stop? Their life won't garner more meaning by having the bank account high score. In fact, they're destroying meaning, because of, you know, the whole destroying-the-planet thing.

I'm sorry, this rant isn't directed at you. I just get angry thinking about that asshat with his self-righteous smile.