It has nothing to do with living in a bubble, it is common sense. When you are using a 3 point attachment you are sitting on the tractor as the operator, you have the ability to stop and start the equipment and to watch what is happening around you, or do you put it in gear and let her go on her own?
Saws have guards and kill switches and used properly risk is minimized. A kid running across a road and getting hit by a car is a far cry from a kid getting caught in a splitter because you flipped the switch and walked away to do something else. I use splitters all the time and have never found a time when having it split on its own would be useful or speed up the process enough to make it feasible to accept the risk.
You all do what you like, I wouldn't use a machine like that unless I was **** sure nobody could get into the work area