There is a large contingent of humans that break any law when they think they can get away with it. But your post seemed to imply that that means cyclist scofflaws are an equal part of the problem. I disagree. When a cyclist breaks the law, he may do it through being arrogant and self-centred, but in effect he's being merely stupid because he's only endangering himself. When a motorist speeds (which they pretty much ALL do, ALL the time), he's being much more arrogant and self-centred than the cyclist because he endangers the lives of everyone around him. When was the last time you heard of a cyclist's poor riding killing a motorist? Even if you can find a single example (which I think would take a lot more than a quick internet search), there are literally hundreds of examples of cyclists being killed by driver inattention.

I think the A+ personalities we see in the bike community may have something to do with how vulnerable we feel when faced with a motorist community that wants us off the road and in some cases is willing to risk killing us in order to get it to happen, combined with a law enforcement community which routinely lets drivers who kill cyclists off with little more than a warning. Such attitudes make the development of an A+ personality a survival strategy.