The question is: can a wealthy philantropist do more good than a wealthy psychopath can do harm? Buying cars is not really bad per se, it just shows they don’t care for anything but themselves. Spending money on research to solve global warming on the other hand…
Edit: I’m just playing devils advocat. I know it is no solution to all our problems and I hate cumulation of wealth in the hands of a few. But thats the world we live in and I just try to find a silver lining.