You concede that the loopholes are the problem but then say we need even more progressive rates. The rates are not the problem (except capital gains). In fact they are too progressive. If you closed the loopholes you could move the brackets closer together and still have the system be more progressive than it is now in terms of effective tax rates.
But how about we keep the discussion about corporate tax policy. The corporate tax issue is simpler because you don't have to deal with the issue of progressivism which is really a matter of opinion.
Do you favor these tax incentives or not? Do you favor a revenue neutral reform of the corporate tax code that would reduce the statutory rate and close loopholes? Obama says he does but then he proposes extending all of these tax credits. The truth is liberals like the system the way it is because they cannot resist the urge for social engineering.
There are things that society benefits from that it's a good return to give incentives to get people to do them. There are other tax credits that are corrupt.
Right-wingers don't get the difference and have a simplistic notion - anything the government does is harmful.
That's not accurate, rational, balanced, it's idiotic and childish, but leads them to sneer at 'social engineering'.
Social engineering is essential if you don't want a Dickensonian wasteland for humanity; there is good and bad, you need to do it well.
Not allowing monopolies, for example, is "social engineering". Allowing them is "free market" and terrible for society.
But I don't see many righties - and I'm not talking about you - who can have any rational discussion instead of mouthing ideology slogans.
On your questions, I'm for closing the corrupt loopholes and credits; for keeping and expanding the good credits (good for a legitimate government interest for the public).
I'm actually open to REDUCING the corporate tax rates IF they could be reduced in conjunction with other steps to tax the rich more fairly (especially wealth).
Liberals DO NOT 'like the system the way it is because they can't resist social engineering'. You are mixing things up.
Liberals like a certain amount of social engineering, which they can do REGARDLESS of the income or flat tax etc.; there are things liberals want to change in the system.
The bottom line is, do you want a class with widely spread prosperity, more productivity and opportunity and a thriving middle class?
Or do you want a third-world economy where we have a plutocracy and a huge poor class, with less productivity and opportunity but some really rich few people?
That's pretty much the choice between the left and right.