Heh. I don't know about "people" but I work to get paid and I picked my job because I enjoy the nature of the work. Not that I oppose doing things to improve or benefit society but why would I even want to devote my life to doing jobs that don't pay well or that I don't enjoy?

I'd rather donate to people who enjoy doing things that benefit society so they can have a good quality of life.

Ultimately you owe yourself and your dependents a quality life well lived. If that means volunteering in places filled with ungrateful or resentful people (most places), then I can only say I wish I was more like you.

I wonder though, is it people with kids or who plan on having kids that value social contributions so much?