As far as I'm aware, the background of the 1953 coup was oil. The democratic government of Iran want to nationalize the oil industry, and western oil companies did like that. On top of that, Iran was willing to do business with the USSR. That's why US and UK secret services conspired with the ayatollahs to overthrow the democratic government and replace it with the shah.

No shit the result of 1979 is not what the Iranians wanted; there have been frequent democratic uprisings since then. Most Iranians didn't really care one way or the other about Israel, although you can't really blame them for not liking the US. And Israel has never really had an issue with Iran. But it's the ayatollahs who have been extremely hostile towards Israel, and have spent decades funding Hezbollah attacks against Israel.

I'm not going to defend Israel; they've committed plenty of crimes. And war crimes. But almost entirely against the Palestinians, not against Iran.

The Middle East is complex, and there's no simply good vs evil there, but the ayatollahs are definitely not on the side of good.