I don't disagree with any of that. You've just chimed in to my response to Nashy's question about my view on the silliness of mandatory helmets for cyclists vs my support for banning shoulder charges in rugby league.
What is always fundamentally missed/ignored/overlooked is that my view is not BANNING helmets, but allowing it to be user discretion when it should be worn. Location, type and purpose of cycling all vary the risk involved of having an accident, to the point where slow in an environment with, yes, no motor vehicles or only slow moving, low volume local traffic by a competent and confident rider is perfectly safe (negligible risk of an accident) and any accident is at such a slow speed that you can avoid hitting your head (just like if you trip over while walking or running).
Mountain bike riding, velodrome track cycling, road race cycling, even moderate speed road commuting or training rides...all higher likelihood of a crash and so I'd strongly advise people wear a helmet in that situation, and as I've said numerous times, I do (although the only situation I engage in is moderate speed road commuting).
My stance is about choice, not about helmets being useless (although there is an argument that for the major cause of cycling injury and death, being hit by a motor vehicle, they are as good as useless...but that's not the point).
There's no situation in rugby league where "choosing" to shoulder charge is safe. The reason being, as a defender to engage in a shoulder charge you HAVE to take your eyes off the ball runner at some stage. You set yourself for it before contact is made, and you have very little if any time to react to a change in direction or height of that ball runner. Whatever the legitimacy of that study I talked about earlier, a 7% injury rate from shoulder charges is too high when the rate of injuries in "normal" tackles would be well under 1%.
The exact same argument could be applied to dangerous throws. Well executed, where you upend the player and put them down safely on their shoulder, you're not going to hurt their head or neck. But you have very little control over how safely you can do that. But even looking at the spear tackles that have been charged, how many have resulted in serious injury? Very few. Is that the point? No, because that's more a case of "there but for the grace of [insert imaginary friend of choice] go I".
Does that clear it up?
TLDR: If I'm riding 15km at 24kph avg (up to 60kph) on a variety of surfaces, interacting with road traffic and thus potentially hitting debris or whatever and falling, I will choose to wear a helmet due to amount of factors out of my control. If I am tootling at <20kph a few hundred metres along separated infrastructure or along wide, quiet roads, I would probably choose not to. I have a choice of situations I face.
If I'm a rugby league player I should not expect to change direction, slip, stumble and be hit in the head by a player who has taken his eyes off me. Therefore I'd want shoulder charges to be banned as most other legitimate tackles I can anticipate and protect myself against.