Wait, what the ****? Where the hell are you guys getting off like this?
Of course Iran is full of itself, every damned country is, and every damned country tries to act in it's own best interests. To think otherwise is foolish.
Iran is trying to gain local dominance in its region, just like most of the other countries that try and jockey for position. "They are mini-america"? What the **** are you talking about? Put it this way, the last major war they had was with Iraq, where they were the ones invaded in the first place, where every other country was pretty much freely supplying Iraq with weapons, including chemical weapons.
That place has a right to feel like they need more power, otherwise they will be screwed over like they have been for the past hundred or so years. From the "great game", the WWII invasion, operation Ajax, the Iraq-Iran war until now, Iran's been the ***** of the area. I think it's fully reasonable they want to make a power grab, because everyone else is in a constant battle to screw them.
However I'm not saying they shouldn't be stopped because they sure as hell aren't doing the region any good by supporting terrorists and causing general havok. But don't brush motives aside when you deal with a problem, at least give them a fair assessment. Iran has a reason to have a chip on its shoulder. They have few allies in the region (and none they can count on), many enemies, and the current superpower in the world has them on their **** list.
Iran has just seen Iraq, which was pretty much just *sitting there* get blown to all hell. I'd be paranoid as hell and desperately seeking a way to avoid that sort of end game. Considering their lack of allies and the impotence of the UN, they certainly can't hope for any sort of fair peaceful resolution. Sure, they could curl up into a ball and concede every point, cut off contact with every terrorist organization they have, stop all nuclear research of any sort, and basically sit there with baited breath at the next commands the more developed countries would have. Again, considering previous history in the region, that probably isn't a very attractive position to them. Who's to say the US wouldn't pull another Iraq on them anyway, invading anyway with no real reason or evidence?
And when you say "a long time ago", how far back do you mean?