[reliabilityguy]

You've missed the part where islamist butchered the leaders of the actual 1979 revolution. In reality it was:

unpopular shah -> 1979 revolution -> islamists take control, prison and kill the leftists of 1979 revolution.

[ifwinterco]

That is true but that’s often how these things go, you pull together a coalition of factions to overthrow the existing elites and then afterwards it devolves into infighting