Your argument presupposes that whatever puppet the Americans install will be better than Hussein, yet you know that is not neccessarily the case, many despots installed by the US have been worse than what they replaced, why should this time be any different??
The Shah was installed by the US and Britain in Iran and look what that led to, Ayatollah Khoimeini.
Claims that US puppet will be better than Hussein are possible but likely about as plausible as that US went into Kuwait to restore democracy in 91. 12 years later, where's the democracy??