The government should be on the side of consumers/workers/the nation at large. Government is the only entity large enough to tame these larger corporations. You don't want them dictating the color and trim packages of Ford F150 that are produced, but you need government telling them that "hey, maybe dumping unfiltered burnt leaded gsoline into the air ain't such a good idea".

Unfettered Capitalism is, in part, when the government is on the side of big business to the determent of everyone else. In that case, the government is actively giving blank checks to these mega corporations - look at the Military Industrial Complex for examples. Or when sweetheart deals are made which blindly favor one company because the CEO is cousins with some lawmaker.