How do you criminally damage your own car?

Seems a bit pointless to me, they can just go and get another shitter for a fiver next day, and then youre back at square one. If you fine them, they wont pay, can't jail them, it doesnt work and the prisons are full, Im lost for answers really.

I worry that it will catch out genuine people and end with them losing their car or costing them money.