The motive was that the car drove down a crowded Chinatown street during Chinese New Year. I imagine something similar might happen if a human driver tried to do the same thing. Not saying the vandals were right to wreck the car, but you don't just creep a car down a busy street during a festival and expect nothing bad to happen to it when crowd mentality/anonymity takes over. Especially when there's no driver so no immediate consequences/accountability. I think it was quite fortunate that it was not transporting a passenger at the time.