The problem seems to me to be that a very small minority of gullible people wants to make their mark on society, and since they have no way to do that in a positive way they use a negative one.

Just like there will be people blaming 'all of Islam' for this atrocity there will be people on the other side that blame 'all of the West' either for their own inability and failure or as as a reaction to the inequalities in the society they are a part of an which they will find it hard to overcome. It is these people that are at risk of being radicalized, the smart ones (like yourself) never were at risk in the first place, have found their niche and simply want to live their lives as good as they can, like everybody else.

It's a pity because these few would be harmless fools if they weren't given the tools and instructions with which they then proceed their crimes, and probably they relish at the thought of the headlines they will be making.

Unfortunately there is no shortage of people that would very much like to blame their own personal failure on others or that would exact blind revenge on innocents for perceived or real sleights instead of seeking redress in a less violent manner.