The top 20% own 85% of the nation's wealth. On even a non-progressive scale they should be paying at least that much of the taxes. Add in progressivity and it should be more. 70% isn't enough.
The imbalance in income and wealth isn't caused by the top 20% hell it isn't caused by most even in the top 1%. I wish people would stop focusing on those in a $250k - to even $1mm (just to throw a number out) category bc these folks spend a lot of their disposable money back into the economy (kids, housing, cars, etc) and they pay for everything w little/no govt benefits (healthcare, education, etc) we want more of these people.
The wealth and income distribution imbalance is mainly caused by a select few in that top 1%. Lets not demonize upper middle income people and lump them into the same group as the mega wealthy.