Govts do many things to provide a free market. Diplomacy, tariff laws, free trade agreements, go to war with oil rich countries, ....

Also Govts cannot just redistribute as they see fit, generally. There are laws and such. Also, the great thing about democracy is that if how you as a member of Govt "see fit" doesn't tally up with how your electorate "sees fit", well they just may not see fit to reelect you, if they can see fit to get off their arses and vote.

James.