I think it's simple, they knew from the start they weren't coming back at all. They wanted to be badasses and go on a bit of a killing spree. They were rushed, chaotic and had no plan other than to kill themselves at the end so they didn't really care what happened along the way. They probably burnt the vehicles for the thrill of it. I don't think they regretted anything but that's JMO.Makes me wonder if, initially, they were heading out to play a real life version of the game. However, after the killings of Lucas and Chynna, they had huge regrets so they stayed out of sight for a few days trying to decide what to do. They realized there was no going back and they were pretty well screwed, so they took advantage of Len and his RAV4 and high tailed it out of there. While driving all that time through BC to Manitoba they made a pack to each other. Just my thoughts.