I cannot give up that easily -- I hope to die in my sleep, like my
Uncle Ray, not screaming like his passengers.

Sincerely, I don't buy the "doing what he loved" bit. I love life, so
I hang onto it, try to savor every minute.

Re-currrent training to a high level of proficiency (different for
every pilot) is what is needed to reverse the horrible safety trend in
glider flying (and aerotowing.).
Go fly with a seasoned instructor for an afternoon and get a "real"
Flight Review.
Beware the "he or she is an experienced pilot" excuse. Laws of
gravity and aerodynamics are no less fatal to the "skygods."
Offer to simply ride along as copilot in a two seater with the older
pilots - don't send them to the golf course.
Try intervention with miss-behaving glider pilots and your rogue
towpilots who insist on a wingover and an aggressive dive just seconds
after you release.

Speak up about the pilots that you have already identified as "an
accident waiting to happen", then look to yourself.
Why are we waiting?