No argument, however the regime that took the Shah's place is openly hostile to the US and there are probably a good number of Iranians who would like to be rid of a bunch of theocrats trying to control their lives. Is life better for them? What is troubling about this whole matter (and I certainly am not an apologist for Israel) is the fear that Iran is going to keep popping off and get their wish.
This was a consequence of the U.S. CIA overthrowing Iran's democratically elected government to install a dictator Shah in power... What's worse? a) Overthrowing a democratic government to install a fundamentalist dictator b) Kidnapping embassy workers for a year?