Some people play things safe, some people are risk takers.
If I am to believe the guilter version of events. I would class Bamber as a risk taker.
Using a woman who is out of it and feeble as a scapegoat.
Selling pictures of his dead sister to tabloids for cash.
Doing a drugs run days after.
Telling his girlfriend of his intentions and then jilting her.
Flashing a designer suit to Dectectives who are on to you saying " me the boss "
With all this in mind, I believe someone like him would drive his car.