Educating drivers has a big effect. You are really stupid, HH. Sorry to be so blunt. If educating drivers had no effect none of us would have taken driver's ed, and they wouldn't even offer driver's training for people who get tickets. Also, all the education about drunk driving would have had no effect. Further, you keep wanting to educate cyclists. Are we the only ones on earth who can learn how to operate on the road? What makes us so different?
We don't need to train vehicle drivers to care about humans. That's not the point of educating drivers. We need them to know that we have all the rights and responsibilities of other drivers so they stop their vigilantism against us. You know, the buzzing, the yelling at us to get on the sidewalk, the throwing stuff and the lectures they print in the news paper. They need to learn how to operate a vehicle safely among ALL the users of the roadways, other drivers, bicycles, pedestrians and horses.
Now, your analogy to diving. Diver's are up against a whole host of factors, almost none of them involving multitudes of other people operating huge machines in total anonymity. Most of what they try to control are how they react to the laws of physics and to their machines. Maybe they learn how to act around animals, I don't know for sure. They learn things like the effect of water on the body, depth and pressure, how scuba gear works. Those things are pretty constant and if you follow rules you can stay relatively safe.
Biking involves mixing it up out there with other operators of machines. Not all of these operators are driving with both hands on the wheel, so to speak. These are people out there with free will, not physical properties to understand.