People run over their kids with their cars backing out of their driveway... The feds want to mandate backup cameras and sensors to prevent the accidents.
Once upon a time there were natural consequences which ensured the survival of the fittest. If your dad told you to hold on tight and not to squirm, and you you were wriggling like a worm, well... If you your dad showed you the spinning flywheel on an old tractor and said don't touch that it will rip your arm off and you just had to see if he meant it, well...
Even with all the warning labels, safety guards, etc people still get hurt. You can't fix stupid.