One interesting thing I came across a while ago was that Jesus healing people was not very sensational at the time, as spiritual healers were not that rare. What blew people's minds about the healing was that he was doing it for free.
Are you seeing users with most of their comments at +/-0, or do you mean you see -1 on all their posts?
I'm pretty sure there is a setting to have your own comments not automatically be upvoted by yourself. The users you have seen might just have had that turned on? Resulting in 0 for all their comments unless someone else upvotes it.
Is this bait for getting justification for making sweeping statements about groups of people? Or am I just in a grumpy mood.