The effed-up thing about Iran is that the revolution occurred because the leader (the Shah) was considered a poor leader put in place by Western powers, and since then the same (well, relatively the same) Western powers have been involved in various attempts to pressure the current government out of power. It's been ineffectual for the same reason you trying to step into a fight between three brothers is likely to get you ganged up on by all three. The Iranian government loves taking advantage of this, and twists their media to portray the West as being collectively against Iran regularly. It's not even convincing in most cases, and there's a growing population there who are becoming disenchanted. But the caution here is that after the first foreign country to go lobbing ordinance at Iran, that disenchantment and resentment toward the Iranian government will be the first thing to disappear, especially if it's a highly controversial foreign country like the US, the UK, or Israel.