uh? You mean the Middle East would be a stable haven of democracy without the U.S. intervention? Sure if you think any of the tyrannical regimes would ever willingly give up power or stop refusing basic liberties to their citizens. Saddam's rape and torture dungeons would totally be not there anymore if we didn't get rid of him! His sons were psychopaths.
The Middle East continues to be a ridiculous hellhole of despair. The Arab Spring didn't do anything long-term. Yemen's gone to shit just this week. Syria is a mess. ISIS is terrible. Boko Haram is terrorizing Africa by stealing and then marrying off very young girls whilst expanding its territory for an eventual caliphate. Iran is getting ever closer to the nuke. Lebanon continues to support Hezbollah. al Qaeda is not on the run.
Terrorism isn't going away even as we leave. Do you just expect it to go away once we're not there? Of course not. It was there long before we intervened and it will continue to be there long after we leave. Until they're stopped of course. But who will stop them, realistically, if America doesn't? Nobody, really.
I'm not saying all would be well if America hadn't invaded Iraq but as you said nothing changed for the people there so I really don't understand why the Iraq war was necessary. The only thing that was accomplished is the increased hatred for the western world.