Nobody asks to take your PVP away from you. You will always have an option to flag yourself and play exactly the same way, as you would play on PVP server. We ask for one simple thing - PVE players shouldn't be affected by any PVP activity.
Do you remember, that in the past players were forming raids to kill faction leaders? And despite of fact, that Blizzard treated this kind of activity as PVP one - it actually wasn't, cuz players were actually trying to avoid PVP as much, as possible. So, essentially it was
PVE activity. So. What stops Blizzard from tuning other faction's cities into PVE raids on PVE servers? M? PVE server, PVE activity, war with other faction still in place - everything is right, I guess. And if you want your precious PVP, you should do one simple thing - flag yourself.
P.S. I don't remember since what moment, but my realm list has been looking like this for ages (no mods - original UI, screenshot is not mine, cuz I don't have access to game at this moment):