I play on PVP server but I must confess that all that jazz (set up by PVP players) about how good was having loki in PVE server did make no sense.
Point is not PVP itself .... point is NON CONSENSUAL PVP.
Peace server could allow consensual PVP with no problem on the side of PVE players (I guess). But the reason why devs do not put consensual PVP in peace server it that too many players from war server will transfer there to have fair fights and the population of war server - which, we shall adimit it, is the heaven of unfair fights - would get a heavy hit (which is not what it needs right now).
On ther other side, putting non consensual PVP in peace server would have induced quite some PVPers to flock there just to harrass PVE players and peace server would have got a population hit (which would have been a disaster for that server).
So basically PVP players advocating for loki rune in PVE server were just supporting a change that would have killed a server where they did not play in, just to have a couple of months of fun clubbing carebears.
Devs just made the right choice leaving peace server in peace.