Go ahead and tax the hell out of me. I'm okay with that. Just spend the money for something meaningful. I didn't get to where I am on my own. It's my JOB to give back. Well, more my responsibility. Life's short, do what you can with the time you have.
I have kids, and the question I ask myself is: What sort of society do I want to leave for them? This is a bit different from the usual "better world" stuff (although a habitable planet would also be a nice legacy!) I mean, I could just set them up for life or something, but I'd much rather leave them a functioning society where they can rely on their fellows (and vice versa) than one where they (and the other descendants of lucky bastards like myself) are insulated from communal life by a fortress built of money that has no empathy and may let them down at some point (didn't somebody once describe wealth being vulnerable to moth, rust and thieves?)
My kids have plenty of advantages already, but a more important one would be a society built on empathy and compassion, not on fear. And that is something we can give to everyone.