There are many in middle class america who pay 50% or higher taxes. Years ago, Warren Buffett's tax rate was 17%. That was without him utilizing tax loopholes or making a real effort @ tax evasion. Many wealthy pay less than 17% income taxes. Recently it came to light that 1% of the worlds population owns 40% of the wealth in the entire world. Some wealthy individuals complain that they pay the majority of taxes. Then again if they own 40% of all the wealth in the world isn't it difficult to imagine a scenario where they do not pay higher taxes than the poor or middle class whose global holdings of wealth are significantly less?
If the middle class is willing to part with 50% of its earnings, then I think the wealthy should expect to pay at least 20%. The way things are now, there are wealthy businessmen in america who pay around 2% income taxes, without factoring in the AMT(alternative minimum tax). There are many large corporations like google who utilize tax loopholes then have the cost of constructing their server farms funded by government tax subsidies. Then they receive tax cuts which give it an unfair advantage over its competition. Its like a form of rich peoples welfare.
Its easy to think the rich are being treated unfairly, I'm certain those are the only stories people hear about in the media. But once fundamental details about how things are implemented in the real world become available a very different portrait of things can emerge.
There are corporations like apple and intel who sit on $80 billion dollars in stockpiled funds that they don't use for creating jobs nor anything. The myth about large corporations being the largest creator of new jobs doesn't pan out. Its small businesses who are the biggest source of new jobs in the country. Not big established names. If anything large corporations repress new and emerging technologies, they also centralize markets and create monopolies, all of which kills jobs.
I agree high taxes and economic prosperity post WWII is a terrible example.
Post WWII a good portion of the developed and civilized world was bombed back to the stone age except for russia and the united states. America had a prosperous WWII as they were in the business of helping other nations rebuild--at a profit. They made reconstruction loans to foreign nations--with interest.
Its not evidence high taxes are a good or even sustainable policy.