The percentage of people who join the server that actually make it to level 60 is incredibly small. Further lowering that number by intentionally griefing people is hands down retarded if you care about the longevity of the server.
If you don't care about it, then I don't mind GMs handing out bans.
And of course it happens to people on both factions. Try not to act like a eight year old for once and look at the bigger picture instead of crying "but tehy did it first imma do it too git gud"