Age
At a southern french club one of the old bullies pulled up in a nimbus 4 straight into a ls8..had to bail out. Few months later scraped into tge normally non landable part of the airfield downwind in a K13 having got p#ssed off with the tug pilot (me) as I wouldnt go out of gliding range during early part of the tow. His influence stopped me tugging as I remonstrated that he should have lost his instructor rating. The club had another fatal on tuesday.
But we had an excellent instructor in his late 70s with parkinsons..often seen doing slow rolls overhead.
not all to be tarred with the same brush.