Two words: Theft. Vandalism.

School = kids. Kids = jealous. Jealousy = ruins show cars, or nice cars in general.

Just ask the kid I knew with an E46 M3 who got it keyed nearly every day during the one week he brought it to a college campus supposedly filled with "mature" students. Ruined the paint on it. And he had no personal enemies, either - just random jealous strangers.