I always love to read Bob's posts and I always learn something.

However...

Those of us who are concerned with safety will act accordingly and seek
the information we need. The others will simply nod their heads and then
ignore the message. The only way to make them safe is to ground them and
none of us have the authority nor the right to do that (unless they're
flying club equipment).

There is another authority. That friendly guy with his own glider
getting a tow from the FBO may be an off duty FAA Principal Operations
Inspector. (A fair number of FAA people fly gliders.) He loves
soaring and soaring people but he viscerally hates pilots whose
careless attitude mucks it up for everyone else. Don't cross him if
you value your pilots certificate.