not everyone is selfish as you claim. I, as well as many mature adults, support higher taxes and work against global warming even though both those things could directly hurt me but are better for the public as a whole. that's the difference i guess.

That is a moral subject so complex you cannot possibly summarize it like this. In most cases "supporting" higher taxes (not by actually paying higher taxes of course, which is explicitly allowed in the tax code exactly to call out people like you) comes with social rewards. Well, talking about it comes with social rewards.

Actually paying higher taxes is so rare and unknown that it baffles anyone you tell that it's actually allowed and that a few people did it.

But in case you don't know, here's how you're supposed to do it: http://www.fms.treas.gov/faq/moretopics_gifts.html

So, did you pay higher taxes, say, last year, or not ? Or does it "matter to you that others wouldn't be contributing equally" or something along those lines ?

http://www.economist.com/blogs/democracyinamerica/2011/11/eg...