I think there is way we can have "pve" without leading to mass griefing.
A player with rage can put down a flag lasting 10 minutes. This flag will cover 200 tiles in all directions.
Any player without rage/murder/outlaw within those 200 tiles has two minutes to leave this contested zone. if they don't leave the zone, then they can be aggroed. Of course, if they exit then enter the same zone, the timer will continue ticking down from where it left off.
I believe this would solve the issue of alt grief pretty well, and fundamentally doesn't change the game much.
I would like to hear any loopholes or problems with this.