One of the best and simultaneously worst aspects of DayZ is the constant-on PvP elements. At any given time in Chernarus, you may be gunned down by a fellow survivor for absolutely no reason at all. Trust doesn't really exist in DayZ. If you are a survivor, you are a target.
This doesn't hold true for everyone, however, as DayZ creator Dean 'Rocket' Hall can attest to. In an interview recently, Hall revealed that he has only killed a fellow survivor in his game one time - and even then, it was an impulse and he still isn't quite sure what came over him.
The incident happened near Cherno, where Dean was playing with a group of friends. Spotting a fellow survivor, Hall and his group tried calling out to him, letting him know that they were friendly. The player saw the group and ran for the hills...
Quote from Dean "Rocket" Hall
“I started firing some warning shots and I just kept firing. I don’t know what compelled me. The next minute, I see him fall over. I struggled, trying to understand why. I did it out of morbid curiosity. I wouldn't say I was revolted — at the end of the day it’s still a game, but it didn't make sense to me.”
Check out Dean Hall's full interview with Dorkshelf.com at http://dorkshelf.com/. There isn't a wealth of new information, but it's a good read for the diehard DayZ fanatics out there.
If you're looking for more information on DayZ and what the game is all about, visit the DayZ Wiki at http://www.dayzwiki.com/.