Is this type of player what game administrators want?
I'm sorry but this isn't a case for administrators. We do NOT watch private messages, because, well, they are private. We value players' privacy and don't want to interfere with what's meant to be private. Even though some people can use it to send insults, we don't think it's a reason to take privacy away from everyone. There's always an option to ignore other players under ctrl+i. After adding certain player to the list, you won't see any messages from him.
It would've been different if the player was using public channels for spreading improper content - he might get banned then.
As for getting killed: Tibiantis allows player vs player interactions to a limit of unjusts system. Conflicts can be considered an integral part of RPG concept (role playing), you can always meet people playing bad roles too. Very often it's even hard to tell who's right or wrong. Therefore it would be solved better within and by the community. The administration isn't here to take sides or put itself as a judge in players' clash, but to enforce the rules, e.g. per cheating.