The flaw in your analogy is that an increase in crime and "white trash" adversely affects everyone in a town. Installing a stereo system in one person's car does not. When I see a Civic with 19" spinners I don't fear for the downfall of Hondas everywhere. Besides, your stock-like Z becomes more valuable with each person who tampers with theirs.
I think you need to put things into perspective... It's a person putting a stereo system in his car, he's not starting a holocaust to strike down every 300zx.