Half the people you listed were insanely rude at pretty much every single comment they posted.
Jake Witmer was pretty much accusing of communism everyone who downvoted him.
911truther deliberately chose a provocative name and kept wailing in every single post about the downvotes he received (which of course caused him to get more downvotes).
sam0345's main problem wasn't that he was irrational, it was that he was an ass all the time.

But I don't even know why you chose to list the above as belonging to the same category with decent people like Mitchell_Porter and MrHen, people who don't follow assholish tactics, and are therefore generally well received and treated as proper members of the community, even if occasionally downvoted (whether rightly or wrongly). As you yourself saw.

The main thing I wanted to do was just POINT IT OUT and see if anyone wants to comment on the fact that this happens, in LessWrong, surely the place where they are MOST likely to see why and how they are wrong. What does this mean that so many people do not?

The main problem with half the people you listed was that they were assholes, not that they were wrong. If people enjoy being assholes, if their utility function doesn't include a factor for being nice at people, how do you change that with mere unbiasing? Not caring about how whether you treat others nicely or nastily has to do with empathy, not with intellectual power.