And if you want further proof, just read the list of bicycle fatalities in SF and see who is at fault. Most of the time it is the vehicle.

This point has nothing to do with whether or not the majority of cyclists are responsible and law-abiding. All it does is suggest that drivers are inattentive, and that the state is strongly biased toward drivers and wrongly backs them up when they kill someone.

I wouldn't say that most cyclists are irresponsible (more that they tend to take risks, risks which may actually be reasonable and acceptable), and I certainly don't believe that most cyclists are at fault when there's a fatality involving a car (quite the opposite). But suggesting that most cyclists habitually follow the rules of the road... that's just absurd in my experience.

probably 80 or 90% of cyclists are responsible and law abiding. There are maybe 10 or 20 percent who are bad, run red lights and do other crazy shit

Just to be clear, your statistics don't actually disagree with each other. It's entirely possible -- I'd even say likely -- that the 10 or 20 percent of cyclists who "do crazy shit" are involved in and responsible for 90% of bicycle-involved accidents.

If you assume that the 20% of fatal accidents that are purely the driver's fault are evenly distributed among cyclists, can you also assume that any 10-20% of cyclists are involved in 90% of accidents?

Fatal accidents don't have to be like general accidents. But.

When I grew up in Germany, infrastructure was good and people obeyed traffic signs etc, when I lived in London it was every man for himself, as abiding by the rules was often more dangerous than not, and sometimes not even possible.

Have you thought of why this is so common? A bicycle uses human power, stopping is a much bigger hassle than sitting lazily in a car. And a bicycle approaches a stop sign much slower than a car, this having a better overview before crossing.

In fact, it's somewhat telling that most bicycle fatalities don't involve a cyclist doing something stupid: most cyclist law-breaking is done when the cyclist believes it's safe to do so, and they're usually very attentive and aware of their surroundings for the duration. It's when the cyclist is in a normal state, and has no reason to expect a surprise attack-by-car, that the fatalities happen.

(As a pedestrian, I very much sympathize with this. I tend to jaywalk quite often when walking, and when I do, I'm super attentive and ensure it's safe before crossing. It's probably more likely that I'd get hit by a car when I have the right of way than when jaywalking. But I'm still breaking the law, as is the cyclist when he/she runs a stop sign.)