Deterrence.

Absurdly, the left do not believe in deterrence as a principle. When you stop to consider this attitude - you have to realise how crazy this actually is.
Let us consider an area where fixed penalty parking tickets are not controlling their parking problems.

Now, let us say that the car of any offender will be confiscated. Just how long would it take for the tough new rules to have an effect?
Oh, there will always be a few numpties - but I will personally guarantee that your urban problem will be solved.
THAT is deterrence!