People who commit crimes like this frequently ‘off’ themselves before the police can catch them.
Doesn’t sound like he is trying to hide anything driving around in a car with a ‘personalized’ plate with ‘Bab’ written on it.
However..if the guy is never caught given all they already ‘know’ about him, we should all be very suspicious of a set-up to look like it was a ‘right wing’ nutter.