Presumably its a sort of tragedy of the commons type thing. Any one rich person could act, but (reasonably) doesn't think they could solve everything by themsel

Presumably its a sort of tragedy of the commons type thing. Any one rich person could act, but (reasonably) doesn't think they could solve everything by themselves. They could try to persuade their rich friends, but unless enough people do it they might feel that their efforts and their precious, precious hoard would have been wasted