Mathematician
Reason, and reason again
The main problem I see with a "tax the rich" mentality is that it can only really be accomplished through tax brackets. The problem with tax brackets is that they tend to screw the people who just earn enough to warrant higher tax.
In England we have VAT (Value added tax) which I think could be a good idea if it was properly implemented. Theoretically luxury items warrant a tax and so the more luxuries you buy the more tax you pay. The problem with this is partly that it depends on consumerism which isn't great during recession and secondly what is considered "luxury" seems to be totally arbitrary. Sanitary towels have VAT for crying out loud.
Now I'll admit I'm not the most knowledgeable person when it comes to tax and economics, but I honestly don't think it's possible to have taxes that are completely fair on everybody.
Income brackets don't screw with anyone who makes more money. You don't jump from 30% to 32%; money at different steps qualifies at different tax rates.
Income tax is probably one of the most fair practices out there, if it weren't for all these "exceptions" we tie into the program. They should be all eliminated.