1) You don't actually know what the law is. You've cherry picked laws that allow bikes to share roads without having even a breath's familiarity with the responsibilities that also come with road usage and the laws that lay out those responsibilities.
2) You equate "being legal" with "being wise". It's perfectly legal for me to go on a diet of all broken glass. But it's a stupid idea. It's perfectly legal, and even specifically enshrined in law for me to go grocery shopping with a loaded shotgun and a backpack full of dynamite, but it's also idiotic.
I think to save cyclists from themselves they should have protected, dedicated bikeways that are not meant for pedestrians or cars but bikes and transportation devices of similar speed and weight (roller skates to Segways). I think that this is a fantastic idea and should be the norm everywhere. I'm not retarded, a psychopath, or ignorant of what the law says. But I do have to share the road with cyclists who are and to save them from themselves I wholly support the above engineering and planning ideas and would even be willing to sacrifice my own income to make this a reality in the form of higher, purpose designated taxes.
If you have a problem with my attitude fine, but you're doing absolutely nothing to dissuade me from my preconceived notions that the community of cyclists I deal with every week is made up mostly of entitled assholes with a death wish.
Anybody who looks at a 40+ mph undivided two lane road with poor visibility and double yellow no passing lane markings and says "I'm going ride my bike there" is perfectly legal to do so. But they're also idiotic morons.
And when they complain that that journey wasn't safe, not because there isn't a good bike lane, but because of all the cars on that purpose built automotive surface driving exactly as they were supposed to, they can go fuck themselves. Because I'm not responsible for their stupidity.