We would all agree there is a line where you would just be a martyr to continue playing based on some principle (e.g., your six year old against a college team). ****,
even MMA fighters tap out when all hope is lost! No need to leave with a broken arm like an idiot. I also agree that in the past 50 years that line has shifted in the US so that we are probably more wimpy as a nation.
Like I said, if it were chess or math team, obviously this would not even be on the horizon of appropriate response. In some sports or battles,
you never quit, you never tap out: you go and take your licks. When it is brain injury, that is no longer always the right reaction: there is a neurological line you don't want your kid to cross based on some principle of sports manliness. It's up to each person to say where that line is for themselves and their family.
Maybe one exception to my first sentence:
Off the Grid.