Just because someone does not want to negotiate or was not there when someone asked for negotiation, doesn't mean we forget about (1) body and (2) family when it comes to aggression (a.k.a. missunderstandings), do we?

I agree. There is no "obligation" to negotiate. It is the suitor's duty to seduce.

I don't want to say there's an easy answer here, but from our conversation I get the idea that (1) body and (2) family are different from (3) land.

I disagree.

You can't protect yourself if you can't feed yourself.

And you can't feed yourself without land to grow things on and hunt and gather water.

Land is essential to (+proHUMAN) life.