You can always just target the vehicle, since the vehicle was obviously involved.

Except in cases where the vehicle was stolen, then it was driven by one of the owners or by someone the owners permitted to drive the car. Either way, the owners are responsible on some level. Maybe not to the level of jail, but certainly to the level of paying off fines (initially), and eventually having the car seized (if the number of tickets is extremely high, as in this case).