Because building for my family's future is one of my primary motivators. I'm not just in it for myself. If I die I want my kids to receive the same education they would if I were still alive. The government already takes half of what I earn, and I will do everything legally possible to give them nothing more when I die.
That's a sadly greedy way to go through life. I understand that "fuck you, I got mine" is a popular motto today, but seriously, have you no shame?
You seriously read it that way? Of course I care about others. That is my responsibility as a human being. I care about my family more than strangers. That is my responsibility as a husband and father. It's also human nature.
Tell you what, you sign up to put my kid through the college of her choice, help her with her first home purchase, generally make sure he has a better life than I do, and make sure my wife doesn't lose her home without my income, and in return I'll happily let the government take whatever they want from what I've managed to scrape up. No? Then fuck off, you sanctimonious prick.