Me and my friends are patiently waiting for the multiplayer feature to come out, doing war is only one of the many possibilities offered by such feature.
We tried the multiplayer mods out there and we kept getting trouble related to either time warp, ship duplicating, random explosions, and more.
If someone does not want multiplayer, so be it, he can still play in single player.
Also, griefing is most likely to happen when playing with strangers, just don't play on publicly announced servers and there should be no problem.