So what exactly is your conclusion on this: "Shit happens, terrorism happens, c'est la vie", or what? That we should just let it happen because it's going to die down if we just ignore it and educate the migrants? To me, it seems as if you have some sort of personal connection to Islam, like some part of your family is Muslim and you just want to calm down worried Westerners who think you or someone in your family is going to blow them up. Not that it really has anything to say as an argument, but it's quite obvious that you have some level of pro-Islam bias.

All I know is that countries like Japan that prohibit immigration altogether have close to 0 Islamist terrorist attacks if they ever had any, and countries with high Muslim immigration numbers experience major Muslim terrorist attacks a couple times every year. This tells me everything I need to know.

That being said, it's really our own fault for buying oil and selling weapons to Muslim countries. There's really no benefits to making deals with "the devil"(that's a metaphor, I'm not religious).