[ANSWERED]Why is multiboxing not forbidden?

Well, why isn't it forbidden to play with two accounts from two different fractions at the same time?
It's impossible for new players to farm specific items. In stormpeaks somebody always logged in with his horde account and killed me over and over again. He always logged in and then out when he killed me and told me to **** off. Damn these guys should be banned but no, i can't even write a ticket because it's not even forbidden. Somebody with a good gear can just occupy a whole farming area for himself/herself.

Our policy regarding multiboxing was always the same.