This couple that was in the same train as me, left their seats to change the diaper of their little baby.
Not only did they go away from their luggage, but they left two phones and a large tablet visible and unattended for quite some time!
It's really pretty simple, happy people don't tend to be assholes. Politicians, if you want less crime don't build more prisons, make life better. I mean, that's your job isn't it?