You simply don't know that for certain, not that my opinion is anymore relevant but...
Given the nation's reliance on foreign oil the risks associated with failure of a puppet are to high to take. If things went south the U.S. could end up with another Iran to deal with.
In the past things were different, the possible rewards were worth it. Not only did we get oil but we had a friendly nation that was a counter to the then Soviet aligned Middle Eastern Nations. We got a twofer. Well, actually it was more than that. We got a market for American goods and American military equipment too. At the time it was important for security reasons and we also received economic gains.
what do you call foreign aid and foreign banks that we give money to? looks an awful lot like propping up a dictator to me.
A leader of a foreign nation doesn't have to be a puppet of the U.S., a U.S. installed dictator, to receive U.S. aid. As I said, it would be likely that the U.S. would help a Western friendly government gain control, and yes aid would be part of what keeps it friendly. But going much farther than that opens the door to great risks that at a time were not factors in such decisions.
The CIA has a long history of propping up dictators throughout the world. Look at all the money that was involved in this and every war.
Again, propping up and giving aid does not make a foreign leader a U.S. puppet, a dictator controlled by the U.S. There is no doubt that at a time the U.S. did prop up puppet governments, dictators controlled by the U.S. But over time one by one they failed or became more and more independent and no longer were under full control of the U.S.
Friendly, but independent, governments tend to last longer and are more reliable in the long run with far less risk of major loss being involved.
As Bob Dylan sang ........ the times they are a-changin'.