If you are (now) "calling me out"...then it would be helpful to present some thoughts of your own versus repeated/constant "tell me....tell me ...tell me(s)..." as frankly a child comes back with (again and again) when he doesn't quite understand the word around him.I can "play" as I like. That is what playing is. I am calling you out on your comment above "allowing 570's to run without bumpers". Back that up with some tech on how that makes the ride more dangerous for the kid. I do agree that they should be allowed underbody protection.
If you run around town currently with your kids in the car and no bumpers due to your failure to recognize where crash protection provides your or your family any tangible benefits then I'm certain that somebody will soon explain decades of NHTSA research to you via a cease and desist fine and/or ticket.
I would rather that you go through that process first given your apparent inability to transfer one concept to the other as they apply to children side-by-side/literally on top of each other while flying through the air in glorified golf carts attempting to win a race.
I can probably find some video of kids ram rodding and t-boning each other but I have faith that you can envision these scenarios yourself.