Why is the US blamed and not Iran's socialist policies which occurred 30 years later, after the revolution?
"Following the nationalizations in 1979 and the outbreak of the Iran–Iraq War, over 80% of the economy came under government control.[34]"
You can draw a line directly from the coup in 1953 to the revolution in 1979, so it's pretty fair to blame the US for the revolution and what came after.