I know its generally the norm in SE Asian Country's to have young kids on a mbike, thats bad enough but also no safety gear at all, i will not ever let my daughter (8) on a bike until she is at legal age, i recall my wife saying she was going to take our daughter (4 year old then) to school on a bike instead of the pick up, i showed her some pics of some nasty bike accidents with kids and she quickly changed her mind.
As a parent things like these accidents you will never get over the loss of your kids which could have been easily avoided, and feel guilt for the rest of your life