A bike going 10km faster than an ebike is not more dangerous than the ebike.

The reverse is also true: An ebike going 10km slower than a bike does not make the ebike safer.

I'm not sure what you're trying to say here.

Ebikes are not more dangerous than regular bikes. Or if they are, the burden of proof is on you. The physics is not, per se, relevant. The physics could explain why they're more dangerous, if they are, but the actual relevant factor is how many injuries they are causing in the real world. You need to show the public that data if you want to support regulating them.

All the data that's been publicly shared so far points to the problem being PMDs and illegal electric motorbikes. Not compliant ebikes.

If we're going to talk physics though, the relevant figure is energy, not inertia. Inertia is a meaningless stat. It remains constant regardless of velocity. Energy scales with the square of velocity, and because of that, a 30 km/h push bike (80 kg total mass) has significantly more KE than a 25 km/h ebike (100 kg total mass). The difference in mass of an ebike is not a significant factor. Heck, even if we decided to use momentum rather than KE (though KE is the relevant stat for damage done in a crash), the difference is miniscule. 2400 kgms^-1^ vs 2500.