On the other side is Speedway the best choice of "employment" for a reforming addict? No routine, long travel around the country, late nights, adrenaline highs and so on.
Throw in that Jason is late 20's so whilst not over the hill there is a shelf life which may or may not outdate the sport in its current guise anyway.
Lets be clear Jason is a complex character and there is probably a whole lot going on under the surface but he has an issue with authority, a known mouth and tendency for violence (prior to chargeable crimes). I know he could have had a sponsored van previously if he produced his driving licence but failed to do so multiple times.
Rehabilitation and second chances are vital for those who have made mistakes but its very questionable if the same environments (in this case Speedway) that previous "questionable choices" were made is the right place for them to happen