The great thing about a bike is that you can get on it and ride. That's the attraction (and one we should sell). It's easy and cheap. You don't need training, licenses, insurance. You can get on and go. It's also generally the preserve of younger people, and let's face, if you're young you have little appreciation of your own mortality. You drink, you smoke, you slide down the side of large lorries. Cycling, by definition, isn't rule-based, any more than being a pedestrian is. Even Swiss cyclists don't follow rules.
This is a group of 'proper cyclists'. You see that in the threads about cycling infrastructure and facilities. We have mudguards and lights capable of waking the undead. We'd cycle to the Moon via an A road. We take it all very seriously. That said, I see plenty of proper cyclists behaving like idiots too, but that mostly seems to be the race mentality, where every commute is a stage on the TdF.
I see a lot of idiot cyclists. Yes, they're annoying and, no, they don't help the cause of cycling. But I kind of understand it. But it's also bullshit to categorise the danger as akin to motorised vehicles. Sorry, I've been hit by a car and I'd much rather it were a errant cyclist. I really don't recommend you try this experiment but I think you'd agree. In several years of London cycling I've been knocked off by one car and no cyclists.
You're not going to get 'professional cyclists'. It's not the nature of the game. But you can change the culture, shame and the occasional FPN go a long way. Mostly it's not a case of following specific rules, it's just a case of not being such a dick. In the end though, life's too short to spend your life worrying about someone scooting down the pavement. Maybe we should accept a little more freedom and stop pretending bikes are merely little cars.