Alot of folks keep pointing out some extreme examples of PvP behavior. This is well and good, as its an excellent way of trying to get your points across.
An exteme example of why I quit hunting in Lush Fields when I was lower level, or other populated hunting spots now:
I am at a very nice hunting spot. I've been there handling the area for 30min-1hr. Great, fast spawns, great xp. Another group/player comes up and starts blasting my kills. We'll call this group/player "Leech." I ask Leech to stop, as I was here first and can handle the area myself. Leech says no. A few more minutes of this and I'm starting to get a headache. Toss in a few "lol, /flip, /moon" right in my face for emphasis. So, I move to another spot, and Leech follows and continues leeching. Apparently Leech can't handle that spot without higher level help. Now, Leech is "forcing his will" on me.
In a suppressed zone I have nothing to do about it either than leaving the zone, or spending another 30min-1hr. of dealing with Leech so I can waste an ARK's time to come out there and tell me that Leech has as much right to be hunting in that area as I do.
In a political zone I can solve the problem in about 15 seconds. Leech won't waste me, as Leech needs me to survive to hunt out there in the first place. But I neither need, nor want Leech's interference, and I can get my point across clearly.
With the a PvP switch in, no matter what I do, I have to put up with Leech.