In my previous comment, I noted that I applaud when I see a cyclist stop and wait for a light, or signal a turn. I have driven near many cyclists, and seen many more blow through a light without even slowing down than I have seen stop for the light. Similarly, the number I see turning without signaling is significantly higher than those I see who do signal. Seeing a cyclist who actually follows the traffic laws is, in my experience, extremely rare.

I don't think it's merely jerks that stick out. I think the problem is endemic, and I doubt it can be corrected by the few good cyclists still out there. The only way to correct the problem is with solid enforcement of the laws.