Stop GRIEFING! - Rant {POP REEL!}

So I was playing on a anti grief faction survival server, I joined a faction on it, it was nice, he let me get some stuff, so I decided to leave after he said he needed a free space, and he lent me some of his stuff so I can start off.

Nice, right? NOPE! I made a nice big mansion with cool rooms and a nice big farm, WOOPEE! It got griefed by that faction owner!

He left a sign saying 'umadbro?'

Yes I was mad, I got a staff member on, and he was begging him 'PLEASE I LOVE THIS SERVER! MY FACTION IS SO POWERFUL!'

My answear was 'You have griefed on a place where you are NOT allowed to grief

Griefer: It wasn't me my brother did it!

Then it went on for about a minute, then he got banned, the staff member was really patient, and nice I might add.

But REALLY?! The Faction owner, not the staff member, griefed on an ANTI GRIEF SERVER, and then claimed it was his brother...

This griefing needs to STOP! I understand if it's PvP, yes it's still annoying and destroyes all of your hard earned work, but it's PvP, what do you expect?

But on anti grief servers, NO! Just NO!!!

PS: Thanks for making me reach the pop reel for the first time :D