easy target sadly.
Why spend time catching the proper car criminals when it takes lots of effort, they are unlikely to stop, thus wasting police time and resources and increasing risk, and if caught will all deny driving it so it gets thrown out for lack of evidence and dropped to a minor "carried in a stolen car" charge so not worth the effort. And then if they can prove who was driving, the cunt wont have a licence anyway, probably already banned so no justice will be done there.
So they go for the easy route, minor traffic offences as they are easy to catch, usually pay up and the cases are all cleared up straight away so is good for statistics.