Jane Galt has some interesting points about why liberals so often support government interevention in the economy, and why it rarely works. I particularly like the two quotes below:
Many, many of the arguments on this site seem to be very well meaning liberals saying fervently "But don't you see there's a problem?" and me saying, equally earnestly, "The fact that there is a problem does not mean that government is able to fix it."The liberal mantra is that the market fails. The free market mantra is that government fails worse. And I think the weight of empirical evidence is on our side.
It sort of reminds me of that quote that "democracy is the worst form of government – except for all the rest". Unfortunately in life, sometimes there is no right answer, there is no solution, and therefore there is no utopia.