We see just stuff now and we're almost used to it. It's a terrible thing and it wasn't always like this.
What do we need to do to stop this shit?
Why are people radicalized ? I'm not sure. I imagine it is a mixture of bad integration, sexual frustration, internet clerics, mixed in with an imperialistic religion. Who would dare bad mouth the prophet all praise be to him ??? Sure, these guys get a kick out of Isis, but Isis is not imperative to their values.
I think it is simple enough to see in the huge parades arranged every now and then to protest Israel. Israel is like the hated step daughter of the West, a canary in the gold mine. No one will raise a cry of outrage if those protesters rough up a few Jews hiding in their synagogue, maybe desecrate some graves, who cares. I mean, IMHO it is clear as daylight that when these folks say they hate Israel, you can see it in their eyes they really hate all the West, it's just that sometimes they don't want to say it.
So I think, the higher the Muslim percentage of the population will get, the more of this stuff we'll see. Once ISIS is gone, there may see a lull, but something else will replace it.
How to fight it ? First end all welfare. End NHS. Privatize everything. No one can sit and brood in the ghetto, everyone must work. That will help integration. People must show an inclination towards adopting local values, or else they should be kicked out. Increase surveillance and deport troublemakers, especially if they are preachers.
People should get over their colonialism guilt. British colonialism especially wasn't all that bad. If anything, it was the Ottoman empire that made the middle east the shithole it is today, but you don't hear anyone whining about that, do you ? All the tribalism, the failed state with a population predisposed to work for cash and avoid taxes, that did not start with the Brits.