Normally these days I tend to keep away from discussions such as this. Obviously tragic, & who/what/in the name of, or what ever, this could be the work of any deranged individual who for various reasons sees this as a way of making a mark/stand for whatever they believe in.
Was listening to a radio discussion some time ago about so called terrorists & what was turning up more often than not was pathetic people who committed these horrible atrocities. Some were just looking for excitement & this sort of thing fitted the bill, obviously there was more to this & some religious nonsense was in the mix as well. Most were single men who were working alone tended to be young, unemployed, fed up with life in general & spent a lot of time on the net, obviously being brainwashed by the vile spiel being trotted out in the name of some geezer who supposedly lived a long time ago & for some reason had the answer to everything
Just to add, most of these nutters are living in the country where these tragic events happen. Take a look at Britain. Similar things happened here with bombings & attacks were generally carried out with home grown nutters.