Ok i am sorry if i offended someone.
but the fact is the bike's speed will not cause serious injury to the pedestrian. Seriously.
do you know the impact if the psycho bus ram you from behind?
do you know most cyclist die because the taxi in front of them suddenly turn in and brake?
If you are a parent, i am sure if your children want to cycle, you would also seriously tell them NOT to cycle on the road. It is dangerous.
Bike speed can be fatal. You can try cycling and bang into a tree. The injuries should be similar to be bang by a bicycle.
As a parent, if I think it is dangerous to cycle on the road, I will get them not to cycle.