It sure looks like you guys got raided by some filthy pirates. Please expect being attacked and raided/sieged, this will happen on our server. Nobody is safe. I implore you to add defensive measures to your claim/base.
Threatening language is a common tactic of any attacker, they are trying to make you leave without putting up a fight. Don’t fall for it. Work on your crew and your allies and put up a united front.

Good luck mates.

Also, nobody can set a home on your base unless they have permissions.

Baz.