Most of people i discover griefing are inmature bored kids. Maybe not all... a few days ago a player came to my little classical city ( you know, with greek temples, a forum, and that kind of stuff ) and started griefing, removing blocks, breaking things.
Then he saw that i put a lot of time on it, lots of buildings everywhere, 100% survival, and he came to me and gave me all the blocks so i could repare the city.
I can understand those griefers who destroy ugly cubic-houses, but when you want to use the game to do something good... you don't want a stupid kid to come and destroy it just because he is not mature enough to understand the time and hard work someone has to put to do it.
At the end it is all a matter of personality and mature thinking.
