No killing without some kind of provocation.

[dra6o0n]

Problem is that your applying modern common sense into a game based in tribesmen era. Not every player will want to roleplay with you.
Nor can you force players to do so, because that would be stupid.

[Darkavatar]

Being in range of a bored killer is provocation.

[Zirikana]

Another important point is that the whole world can go full apocalypse without any warning, should The Devs decide to wipe it out and make a huge change, so don't ever get too attached to your accomplishments!

A big part of this game seems to be not just building your own little homestead, but learning and figuring out ways to defend yourself and foil the griefers. Either feudal/mobster style security arrangements, or monkish devotion to training combat skills and becoming a ranger, or even more monkish devotion to living out in the middle of nowhere away from all water and resources (that's how I play it )

I got my camp ransacked very early on in the 3rd world, and i was very close to ragequitting, so I can empathize with the whole "it's not fair!" thing, but putting arbitrary controls on who can attack whom is a bad idea, and would fundamentally change the whole game in a bad way.