"I've been destroyed. Maybe if I destroy, I'll feel okay."
https://www.youtube.com/watch?v=7L4JnAuW00k

The reason for vandalism is it's an outlet to prove one existed and force an undeniable, hard, experienced reality onto a dissociative apathetic culture that is not acknowledging or ridiculing discomfort or suffering.

That which destroys beauty and yet pretties itself up with a veneer of legitimacy, shall have its pretense destroyed. Contrast, is the purpose of vandalism.