I think we can extrapolate that to ourselves - or at least, I often do that to myself. I'm relatively wealthy thanks to having the luck of the thing I'm interes

I think we can extrapolate that to ourselves - or at least, I often do that to myself. I'm relatively wealthy thanks to having the luck of the thing I'm interested in and good at being in great demand. What moral right do I have to that relatively large share of wealth, and why am I allowed to choose how much to donate to charity, and which charities? (That is not a rhetorical question, but a genuine moral dilemma.)