Two legged monsters like that deserve as little respect as they give.
Being drunk is no excuse or defense for their crime. Yes, I am well aware that I am being harsh and closed minded about this, but would you want to find damage like that done to your property?
We need to start getting tougher on our standards and doing everything in our powers to deter destructive behavior. It is our responsibility to make sure that the next generation can appreciate nature and all of the species that we have.
Behavior like that is not acceptable for anyone.