I just recently started playing, and the first time I came across another player, I saved his life by axing a zombie that was attacking him. I didn't know how voice chat work, so I just left him and continued my search of the area. Saw an AK-47 looking weapon, and while I was trying to figure out how to pick it up, the guy walks in, grabs it, and shoots me. I can say that after that experience, I probably won't trust another person. So it only takes 1 backstabber to ruin those of us who actually want to be kind to other players.