The world is becoming very terrible everyday that people are not scared in committing crimes, people are not scared in killing one another . What will a man gain by killing fellow human being . I think people needs to be very careful we are in a dangerous time that terrible things are happening, people needs to be careful the way they relate with people. Trust no one , the heart of a man is very wicked that no one cares, just get joy in deriving evil.
I do not think it is about being scared of commiting crimes or not. If I had to guess, I would say it was more to do with a mixture of radical ideals and also mental instability, one if them is enough to push anyone to commit disgusting acts, when both are present then worse things can happen.
Though, I indeed agree with you we all should be careful during these strange times and do not take unnecessary risks ir deal with people we do not fully trust, those tourist did not take any unnecessary risks though, they were just simply trying to have lovely vacations in a lovely location. In the end that is what terrorists want, to make us afraid of living a meaningful and good life.
