I don’t get guilted or shamed easily, it’ll be tough for you to get the reaction you want.
I never got a concussion from playing six years of football and 18 years of organized baseball. I was not a basketball player. I know you think I did at some point, but arguing is pointless. I know of two times when friends of mine got actual. diagnosed, non-football concussions when we were kids (one was sledding and one tripped and fell down his deck stairs, breaking his nose too). Both played football on the same team as me for those six years. Of the two, one is a successful orthopedic surgeon in Chicago and the other is a full time CPA and part time pastor. I see each at least once a year and they are both well adjusted, quick witted, happy family people. Are they both going to be struck with dementia at an early age? Who knows? The halls of nursing homes are inundated with dementia patients who’ve never played a down of football in their lives, so I think it’d be iffy at best and irresponsible at worst to blame it solely on football if they did.
You are doing two things with this argument that make you sound dim witted, although I don’t think you really are. First, you’re trying to use guilt as a persuader by implying that my son will develop dementia at some point in his life because I let him play football. Second, you are being hyperbolic when you say that everyone who’s ever played football has been concussed which, even though you know isn’t true, you still keep insisting. Both of those things make a weak point even weaker and make you sound desperate to win an argument. Trying to guilt people and speaking in absolutes in a debate is equivalent to saying, “because I said so.” You can do better. I’m a moron and I can even see that.
Whatever you do, don’t come back with more of the, “you’re hurting your child intentionally” spiel; it isn’t going to work, and “I’m rubber; you’re glue” isn’t something a man of your age and stature should have to resort to.