You are kidding, right? A 17 year old irresponsible kid on a heavy bike going 30kms/hour (say, 20mph) vs irresponsible 17 year old kid in two tonnes of murder metal going 160 / 100mph, what's more dangerous?

Ebikes can and should be limited to 25-30 (say 15-20mph) and anyone breaking that loses their bike. It's not a big problem.

Cars are literally big problems

Edit: bikes require, just like cars, good infrastructure. Build that and it's good