That seems sort of silly - I would posit instead, why should we care much about which causes any of them value (and their reasons why)? Why shouldn't Mr. Gates

That seems sort of silly - I would posit instead, why should we care much about which causes any of them value (and their reasons why)? Why shouldn't Mr. Gates be allowed to allocate as much (or as little) of his funds to a cause which a) needs attention, badly and b) benefits a massive number of people in the immediate future, and long term? Some people value the needs and well-being of others equally, or higher, than their own.