Not sure why you think you can state this as an absolute. Is there any data to back this up? I don't think it's that cut and dry. These guys have been playing with a helmet their whole lives you think they'd be able to adjust their natural instincts over night? And removing protection from players from the neck up would cause even bigger problems and concussions from blows to the head from forearms, elbows, knees, thighs etc... Removing helmets wouldn't make football any safer.No one… Is going to… Go head first…. To make a tackle….Without a helmet.
It doesn’t matter the situation. No one will do it. They will only do so wearing a helmet. Helmets cause these collisions because players don’t have to worry about bruising their faces and heads when tackling. No one wants to bust their face open to make a tackle