Well our previous President DID describe them as part of the “Axis of Evil” along with Iraq and Korea. We have overthrown 1 of 3 of the countries so identified, so far. I think the current regime in Iran SHOULD feel threatened by the USA. If we were led by someone like T.R. we’d have already deposed their Ayatollahs and replaced them with modernists friendly to the west.
The question isn’t “why they are doing this” at this point, history is history. It’s “what are we going to do about it”. If anything.
They've flourished since 1979 and we have not lifted a finger against them. You can think what you want obviously, but the schmucks in charge over there know the US a lot better than you do.