PiKapp, you have to separate Islam the religion and Islam the political system. They are distinct. It's like Judaism and Zionism (there are hard line Zionists, for instance, in Israel that are just as ruthless as the Islamists, only they are held largely in check by the secular government there. If Israel ever became a failed state, all hell would break lose there -- and before you say, no, there aren't, take a look at some of the recent price tag attacks in the Palestinian territories).
There's an ongoing fight in post-colonial Middle East between those who want a secular government and those who want an Islamic government. This has been exacerbated by the successful 1979 Islamic Revolution in Iran, which forced Saudia Arabia -- in their mind -- to begin exporting their own version of an Islamic State to the rest of the Muslim world. There's also a bit of ethnic and cultural supremacy going on here between the Arabs and Persians (reminds me a lot of the white supremacist ideology that rears its ugly head from time to time -- Neo-Nazi rally in Brussels over the weekend overtaking a memorial for the bombing victims).
You couple that with the rulers of many of these so-called secular states (Saddam Hussein in Iraq, Hosni Mubarak in Egypt, Moammar Gadhafi in Libya, the Assads in Syria and so on and so forth) and you've got populations in much of the Muslim world who are sick and fed up with these so-called secular governments.
You look at Turkey, where you've got a military that is staunchly pro-secular against their current president who is a self-stylized "moderate" Islamist in Erdogan (because, you know, a little Islamism isn't that bad). You've got hardliners in Indonesia pushing on the secular Indonesian government to become more Islamist. You've got Islamist factions in Tunisia trying to push back against the secular government there, the same in Jordan, and Algeria. Islamists briefly took over Egypt, and now you've got a huge fight in Sinai. Libya is split between the secular government in the west and the islamist government in the eats. The Taliban is making it very hard for Pakistan to liberalize their democracy (but it seems like the population there is starting to fight back. We will see how that goes in the next generation or so).
The Kurds belong in their own special place, because they are mostly Muslim, but are largely socialist in nature (the Kurdish HDP in Turkey, for instance, successfully ran on a platform to block Erdogan's constitutional reforms and are calling for more liberalization in the country, not less), but they have no country of their own.
In other words, these terrorists are forcing an identity crisis on the parts of the people. The hard line Islamists who are in power in much of the Middle East will fight like hell to stay in power, or to remain influential in regional politics, but I think there is a legitimate beginnings for a reformation movement. This is going to take some time. It's going to be messy and bloody and horrible, and the Middle East is not going to look the same as it did when it started.
Shias are like the Gnostics of Islam; they believe they have superior knowledge. If you don't believe that Shias believe themselves superior, just ask a Persian, i.e. Iranian, and they will tell you they are better than anyone. 
