You assume the plan was to benefit Americans by invading Irak. It was quite the opposite, the plan was to use tax money to finance operations while profits went to private companies, this is not a new concept.
Understand that modern warfare is ultimately governed by profit of the few at the expense of the masses, the economy was artificially inflated to mask the cost of the war.
Sadly, it is only when personal pockets of comfort are affected that the public at large start to question their government, when is too late.
And even then excuses will be made to defend the mental image that the exploited cling to, it was not my country that did this to me, it was something else.