Pure Capitalism, as with Communism, on a huge scale is self destructive or not?

Certainly capitalism is fine thing as it provides necessary incentives while Communism has not only proven to be a failure but in fact has never been tried as it is impossible to enforce as a doctrine- once the top contributors arrive they immediately create an entirely separate cl with an entirely different set of rules. Capitalism requires regulation by a centralized government as has been proven by the most recent, debacle of deregulation via the Republican hegemony. This or submit to Robber Barons of the previous century whose offspring continue to retain a strangle hold on our individual liberties and fortunes in a profound way. Why replicate this cl yet again for an additional stranglehold? Isn't it reasonable to return a just government Washington and establish the will of the people rather than a fountain of blithering ideocracy? Insist that Obama play the full hand and stop bending to financial interests.