Thing is the bike should not have been on the pavement.
If it had been a car or motorbike being driven up the pavement and hit the kid them you would probably be looking at a ban + big fine or even a custodial sentence, especially as it probably would have ended up with a more serious outcome.
In the case of a car hitting a bike in the road then yes, it may well be the fault of the driver but both of them are meant to be on the road. Driver might be drunk, distracted, on phone etc which needs extra consideration and do seem to not attract the sentences they deserve more times than not.