As it is now, it's like EVE Online. If you play the game for PvE, you go into it accepting that PvP can, and will, happen. It also has so many options to befriend, betray, or jsut whaever you want within the PvP because of how open ended and freeform it is. PvP makes the game good, people are the real threat in most good zombie related books, films, etc. But in games it has always been the zombies. But no, DayZ is doing it right, and introducing the people as a threat thing, it's much mroe unpredictable and tense and it just adds so much to the game. It's not you vs. some zombies, it's you vs. the zombie apocalypse and all of the "realistic" dangers that are associated with it.
If somebody honestly thinks running around with friends killing NPC's all day and hoarding loot with no threat of losing at any time unless you fuck up massively, then all I can really say is go play an MMO. You'll love it. Maybe borderlands, if you want a shooter.
Edit becasue I've actually read the post and not just the poll now: As somebody has mentioned already, to survive you need equipment and loot, and the best palce to get that is from loot pinatas. Erm, I meant otehr people who hoarde stuff. Both killing other players or befriending them is a valid way to get access to that stuff, one is a lot safer, killing them, and the other requires trust between both players. So it's a perfectly valid thing to do to survive. On a non PvP server, goodness knows why you'd want to go on a non PvP server but whatever, I can understand your concern more. But in that case it's likely somebody just spamming into any server without reading the name, or somebody intentionally trying to piss people off.
, and generally getting pissed off at it.
