There's a big group between the assertives and that avoiders that can use the roads perfectly fine, *if the roads are tamed*. As many do in Oxford. Your assertion does not hold water.
We all need to start somewhere if not used to cycling in traffic since youth. Or, like in my case, never cycled at all before. On top of that, one here does not have "cycling examples" because so little people cycle.
I try to watch other cyclists on the road, what they do. Seems though if I act the same I end up getting beeped or shouted at. I am too slow (max 10/15 mph) to mix with fast flowing traffic.
Truly, if there had not been a way for me to cycle from home to work avoiding traffic (this meant using a pavement for a short stretch) I would have never started it.
I was looking into an alternative method to public transport transport into work - I don't have a car - a colleague made me consider a bike. He cycled, little did I know he lives only 5 minutes up the cycle path!
My commute is 5 miles, mostly parks and cycle path. I was terrified, still am at times, on the dual carriage way. I use all sorts of diversions to make my journey safer: keep buses/lorries in front, don't filter, cross on foot when the junction is too much for me to handle.
Still there are scary moments (I don't post about them in commuting, 'cause I'll rather not be reminded) but I have learned to live with this: the advantages of cycling outnumber the stress ... for now.
My friend (experienced cyclist btw) got run over a couple of weeks ago. She was left lying on the road. Driver gone, a passing pedestrian crossed away from her, didn't want involved.
She straightened her handlebars, carried on to work on her bike, hurt, wet, dirty.
We don't even have a shower, she had to clean up as best as she could.
If this happens to me I know I'll not stop cycling: I'll take to the pavement again