Truth is, no one has ever really known how much regulation is "appropriate." Capitalism is still largely an experiment, after all. And our nation is still relatively young compared to the rest of the world.
Just look at the reactions we've had to the two stock market crashes in our history. After the first crash, many people considered FDR a socialist, but he may have been the savior of capitalism. After the second crash, many people were upset about the bank and auto bailouts, but it did save GM.
Anyway, I agree with all of you.... capitalism is good with the appropriate amount of regulation. What that amount is, I do not know!