While I learned long ago never to judge the misfortune of another pilot, I think it is instructive to learn from the incidents of others. Many years ago I owned and flew a glider out of Minden during the summer months. I did do some wave flying, while not an expert I did identify the dangers and tried to minimize them. Imagine if Bob could not have gotten out of his glider and/or his glider killed someone on the ground. When I was flying from Minden I sought out an great flight instructor with a Janus and several hours of benign spiral training before the beginning of each season. After the training in the Janus, I would try benign spirals in my bird. I also found a 57mm horizon from a F-4 and installed that in my panel. When I was in wave with any moisture I always spun my horizon up and left it on. I also was a current instrument rated pilot.

If you are going to fly wave, or fly at all, practice mindfulness. What can you do to minimize risks to yourself and innocents on the ground or in the air with you? I do believe Eric Larson had a horizon but it was not spun up, and he certainly was/is a qualified instrument pilot. With today's instant on horizons it is much cheaper to spend the money to get one than to risk your life or those on the ground. Fly a few hours under the hood each season with an instructor.

One more point and this applies to driving and flying, dress to egress. I was surprised to see Bob's down booties stayed on his feet. However imagine if he had landed on a mountain side and the booties had come off, or even if the booties hadn't he would be screwed either way. Summer or winter I never wear cotton, nor short sleeves nor shorts. My foot wear is always something I can walk for miles in over very rough terrain. This paid off one night when I had an inflight fire and landed a power aircraft deep in the mountains at night. I had a good survival bag, my only mistake was among the FIVE flashlights I carried, not one of them had white light, they were all red, blue or green.
the colored flashlights are great in the cockpit at night, but worthless on the ground at night. Think more than one step ahead. I also fly with a little adventure survival pouch in my pants pocket and an Alan Silver survival pack on my chute.

As for judging other, I had read an article about a 7,500 hour ATP that stalled and crashed an easy to fly light twin in good daylight weather. I thought what a fool, how could anyone do that? Two days later I almost stalled a light twin at twilight in good weather, question answered! I thought about my mistake for a long time and I tried to learn as much as possible from both what happened and my thought process.

Fly safe and never put your brain in autopilot!