It would be a gross generalization (and a wrong one imho) that "Europeans accept e-bikes". Most of my serious (bio-biking) buddies don't accept e-bikes. They feel that e-biking is a totally different sport and not the right one for most of them. (on trails for recreation).
There are however TONS of people who never actually rode their bikes and now ride e-bikes a lot. But most of them will not ride trails, only bikepaths or bike lanes. They often lack skill and our endurance to ride the heavy bikes safely on trails.
And then there is the group of e-mountainbikers on trails, which consists mostly of fit-ish younger guys too lazy to ride proper bikes. Some of them don't know trail etiquette, because they just ordered their e-bike online after watching rad youtube-vids with loads of skidding and sick e-bike jumps.
And then there are 0.01% former real bikers, who can't ride because of some health issues or really old age. And if they can ride again on an e-bike, I am all for it. Truth to be told, these cases are pretty rare.
If it was up to me, I´d ban e-bikes on trails, but introduce a special permit for people with a certificate of disability.
For commuting and general recreation riding (not on trails) an e-bike is LOADS more efficient than your average Best-Ager Mercedes Cabriolet - so I am all for it.