Tax the Rich!

I get the argument behind the idea. The rich can afford taxes more than the poor. Of course, I think taxation is theft. I think it's a legalized form of slavery. If I'm taxed on 10% of my income I'm a slave for 1/10 of the work year. If I work 10 hours per day, I'm a slave for an hour. But slavery is slavery even if only for a mere moment...is it not?
So, what if I make $80,000 per year and my neighbor makes $100,000. Let's say for simplicity's sake, I don't get taxed (don't want to screw up the math). Let's say my neighbor has to pay 20%. Well, looks like we're on equal footing, right? He had to go to college longer, and probably a better one, so he's not getting a very good payoff.
Then my other neighbor makes $130,000. What if after taxes he makes "only" $75,000. You know, he can afford it.
So a simple question I have to ask: Why should I bust my butt to work hard and make a lot of money when I may make a little bit than a guy who doesn't work as hard and didn't have as good of an education?
Taxing the rich a lot kills ambition.