It is all nice in theory and sounds good if you are in church but in reality it is bad for economy of any country overall if it is not balanced well. If you are very rich you usually have freedom to move your business to other country with lower taxes. In result your country loses. If you are just somewhat rich that's starts to be funny. E.g. with my salary I'm in top 25% of people and to enter this rich class I need to yearn more than 1000$ per month (before taxes). E.g. this number is smaller than minimal wage in USA (8$*160 hours). Any progressive taxation on rich in my country would make people simply emigrate to other countries with lower taxation (e.g. Ireland) or will cripple any motivation to work more (why should I work extra hours for several dollars per hour? That's what would left for me after taxes if some aggressive progressive taxes were introduced here).

Don't get me wrong. I don't have anything against progressive taxes but usually they are balanced poorly and do more harm than give value.