As for non-islamic terrorism:
https://en.wikipedia.org/wiki/The_Troubles
But really, the chief problem is that Islam is popular in a part of the world that is particularly unstable right now, largely due to Imperialism.
we were in japan at the end of wwii
and korea after that war
oh and don't forget germany
you could call that "imperialism"
oh but wait they aren't chopping heads off and raping women why is that
Maybe it's because we left after we beat their asses and we barely tried to make them like us. Look up the Golden Arches Theory and you'll see why Germany, Japan and Korea are the way they are now.
You can even take that back all the way to the Philippines in the 1800s. Only real reason the country's forgeted up right now is because of Rodrigo Duterte. Otherwise, they're somewhat ok.