I've had moral/emotional hangups on the sport for years, because I will admit having some problems watching SOMEONE ELSE's kid give me fun running that risk while secretly glad my own never wanted to play. (This "unrestricted free agency" and "stay in college, make big bucks" is pushing me the rest of the way out the door).
I can't link it due to paywall, but several years ago, the 1986 NY Giants had their 30th anniversary of winning Super Bowl 21. The story stuck with me because one of the things I'd never heard of at one of those gatherings was they were all trading information on "good doctors to see" for their after career effects - and comparing who had what wrong with them. That's not - to me at least - what a reunion of a championship team should be. Some of these guys couldn't say, "Remember when we beat so-and-so," because they don't even know they're alive, and it was pretty bad.
The other one that got me is one day in March 2019, the guy from our pathology lab asked me if I had any Styrofoam containers that are inside the shipping boxes, and I gave him one.
A few days later, he let me in on why he needed it: the brain of former NFL player "Lam" Jones was in it and being taken for CTE study as he had just died. That was one of those circle of life moments, where you're providing the transport for the brain of a guy you used to watch play on TV when you were a kid.