There was a bomber in Texas who murdered several strangers with package bombs left on their doorsteps. He blew himself up just before he was captured. I don’t think we ever got an explanation of his motivation. It’s really rare, but it does happen.

The fact is that most of us are alive simply because no one has decided to kill us yet. There is no complete safety in this life, so you may as well take reasonable precautions and chill. Enjoy your life.