So taking Italy out of WWII didn't help because we didn't have Germany yet? Or getting Germany didn't solve the problem since we hadn't beaten Japan at that point? Your logic is lacking, but then that's not new.
We weren't told, before invading Iraq, that it was some sideshow akin to Italy in WWII - rather, it was supposed to be the storehouse of WMDs and co-conspiritor with Al Quade. This all turns out to be a bunch of bunk. Meanwhile, we let the Al Queda bigwigs roam Pakistan and Afghanistan, and diverted the forced needed to shut them down, to an unneeded invasion of Iraq. Now you want an unneeded invasion of Iran -- but you're content to let Al Quade keep at it in Pakistan and Afghanistan, where there's no end to the war. Sorry, I believe in taking the war to the real enemy, not getting distracted by other agendas.