I vandalize graves.
I'm very shocked to know about this. Why are you vandalizing graves?
I do it because it's fun.
What you are doing is terrible. You should be respecting the dead, not vandalizing grave sites.
I don't see what's so wrong with it.
The thing that's wrong is that you're being disrespectful. No one is being harmed with what you're doing, but you're actively disrespecting the people who are buried on those graves as you are damaging their  resting place. I suggest you clean the mess you have caused and just try to be more respectful with others' property next time.