@O_G
Fair point.
Meanwhile, in the Paris attacks it was alleged that at least one attacker - who we learn could have been among the French or Belgian home growns - shouted "This is for Syria".
They, evidently, regard attacks on remote countries who just happen to share their religion and/or ethnicity as being the same as an attack on someone close to them. A classic case of that taking offence on other people's behalf.
Or, more likely, a weak excuse to express a long-harboured hatred of our way of life.
Or they hate the USA but cannot get in because of their immigration bar, so they take it out on whoever is conveniently within reach.
There was a new observation, in today's news was that they can live in one country and be monitored long-term by security services but get in a car, cross a border and the non-joined-up police there have no clue that they are a threat.
Dropping border controls was insane.