Which companies do you propose we bust?
The last company people around here proposed be "busted" was Microsoft for it's bundling of IE... something which as we now know looking back has turned out to be mostly irrelevant.
A lot of people around here seem to want to "bust up" Google, but fail to provide any evidence of them actually using their position in any given market to influence their position in another unjustly. In fact, quite the opposite since they seem to go out of their way to list direct competitors prominently in their search results... Antitrust law does not allow the government to "bust up" a company just because they turn out to be wildly successful.