Destroying other player's month long work is never fair. It doesn't matter if you do it alone or together with 20 people.
Doesnt matter how many people, it should take some time. The building of the base takes a a lot more time, than destroying it. Something people are building for weeks and months, should not be gone in hours or days.
It doesnt matter how many people or how much time.
Permanently destroying someone else's month long hard work against their will is a dick move.
Always.
It's amazing how so man people here aren't able to understanding that.
I blame it on years and years of breeding a certain kind of community.
