Well I'd argue 50% of the population got a raw deal in the revolution at least.

Cubans kept massively supporting Fidel for quite some time, and quite explicitly, even through the disastrous Communist economic policies.

Iranians keep protesting; last few years have seen several large protests, involving hundreds of thousands, and continuing for months. The popularity just isn't there.

Regarding revolutions, it's quite often that a relatively small group of like-minded people capture the control, and the majority is weakly supporting them, or is even weakly opposed but complies. The French revolution was mostly about some nobility wanting to remove the monarchy that oppressed them, along with the rest; most of the population wasn't overtly anti-monarchy, and not even covertly so, but it did not like the monarchy's pressure either. The Russian revolution was "communist" and "proletarian", but even by their own Marxist accounting, proletarians were less than 10% of Russian population, and communists, much fewer still. Nevertheless, they subdued most of the Russian empire.

The Iranian revolution was also done by a group of highly religious people who were fed up with the shah's secularization reforms. The shah, AFAICT, was a guy a bit like Putin, or Saudi kings: efficient and geared towards prosperity of the country, but quite authoritarian. The fact that e.g. the educated urban population in Iran wasn't happy about authoritarianism does not imply that the same people were (or are) huge fans of theocracy. Actually, the theocracy ended up even more oppressive.

The Cuban revolution was more of a coup than a widespread national uprising.

It was a blind alley anyway. Zero countries that embraced Marxism-Leninism were able to reach prosperity on that ideology. Meanwhile, a lot of desperately poor countries of the 1950s are nowadays reasonably well of, on the basis of a normal, regulated market economy.

Not "happy", but Iran was quite a bit more sober, not hostile towards Israel, and relatively secular.

(Similarly, China under Deng Xiaoping was not a paragon of political freedom at all, but it was quite a bit more sober than under Mao Zedong. The US administration had tons of shortcomings under president Biden, but it was in quite a bit less of disarray than under president Trump.)

Installed. We overthrew Mossadegh. We overthrew a democracy.

People keep saying genocide but has it been established objectively? I seem to remember the ICJ deciding they weren't, but that was some time ago.