PVP currently is set to on by default in people's housings. They don't know/expect to be attacked so they neglect to turn it on. A player goes in and attacks them as they're building, leading to them struggling to ban or turn pvp off. It's hard to type a command as you're being attacked and such so maybe it can be set to off as the default. That way, players can toggle it on when they need to and never be attacked while they're peacefully building and starting out, not knowing it's on and they can be attacked out of nowhere.