the section called What Is a Vandal?
that being a vandal is partly a matter of belonging to a particular subculture or social network with a shared history, an inside and an outside. In the far past, vandals were a much less cohesive and self-aware group than they are today. But the importance of the social-network aspect has increased over the last thirty years as the Internet has made connections with the core of the vandal subculture easier to develop and maintain. One easy behavioral index of the change is that, in this century, we have our own T-shirts.