Make server rules more clear
Currently, the rules of each server aren’t too clear, leading to many of the new players believing that stealing or killing are acceptable in all servers, when this is not the case.
I would suggest a message before you load into each server about the rules and repercussions if they are not followed.
How about a rule board in the tutorial area and in the start area of each server?
On one hand I want to point out that the people that think stealing and killing is okay on all servers is already not paying attention, but on the other hand it’s because they are kids and they still cause problems for other players, so something like what Zebulaun said would be good, just have to make sure they can’t just skip it so easily like if it was just put on one of the signs in the tutorial, maybe if there was a combat section of the tutorial that mentioned it?