I heard this on the Thom Hartmann program once:
Capitalism is like football. You have rules, refs, and goal posts -- regulations and regulators. The rules make it possible to play the game, and while some rules are stupid most of them provide the structure that enables the team to move toward the goal and win. Sometimes the regulators make a stupid call and a team suffers unjustly (Seahawks...), but most of the time the refs keep the game running smoothly.
Same with capitalism. Essentially, if you take away all the rules, refs, and goal posts, you have a bunch of guys scrambling around on a field beating the crap out of each other and stealing.