There are people here who come from countries that were the target of America's equally fabricated reason to get into WWII. I would love to thank the US government for fabricating that (at the very least blowing one incident way out of proportion). My family has killed people for simply being on the wrong side of that battle, merely to make some profit selling pigs, or repairing plumming. You know what ? They were right too.
The problem with Syria is that the government is in the right. Or at least, it's less wrong. The rebels want to do religious cleansing of the country and the government wants to survive, and it's own ethnic group to survive. Of course Iran, equally being the target of the sunni muslim religious cleansing, supports their not-quite-brothers. Erdogan wants to "help" the rebels because he's on the side that wants to do ethnic and religious cleansing in Syria, and presumably because it would distract from his local problems. The problem in Iraq is the same basic thing. The good thing is that sunni muslim attacks in Syria, Iraq, Pakistan and Afghanistan are mostly their actions out of western nations.
But please don't be so stupid as to think they're ok with the US and generally the rest of the world just because they don't want to turn a 5-front war into a 100-front one. And also don't make the mistake of assuming they don't have support in America or don't have massive support in Europe. Both from local muslims living there, and from the governments that are afraid of these mad attacks.
As for Turkey, what do you really expect the leader of a sunni muslim religious party to do, except declare himself caliph and behave like he owns the world ? What exactly do you think he means when he says that "some" parts of sharia should be introduced ? You think he means to stop at "some" ? Really ? Religious freedom ? Sadly there are hundreds of millions of people who believe doing this is the answer to all the world's problems.
Please keep in mind that before Kemal Ataturk, Turkey, then the Ottoman empire, effectively the state of sunni islam that so many muslims are trying to recreate, had waged a 1500-year long war against the Europe, Asia and Africa. Then in WWI allah's caliph was overthrown, all but declared illegal (you wouldn't believe the number of imams killed and threatened in the 1918 - today period), and the war stopped, to be replaced with the cold war. The nightmare scenario is that this original war resumes.
[1] http://www.washingtontimes.com/news/2011/oct/19/turkeys-abru...