A fast e-bike would be dangerous, anyway. At that point, you should just get a small capacity motorcycle or a scooter.
I don't really see how they're more dangerous than scooters in the same vehicle category.
And our laws are often more lax then Europe's. Specifically when it comes to freedoms (like weapons & privacy). Source: former EU citizen.
Of course, fit cyclists can cruise at 30+. But to get to that level, you've to put in serious effort and by the time you got the power, you know your responsibilities too. But giving anybody 30km/h vehicle that is legal on shared paths ain't good idea.
If you're afraid of cars overtaking you, get a small motorcycle.