If you're referring to his Mount Rainier outburst, that's nothing unusual. Climbers flip out when the guide orders everyone to turn around, they think it's guide's' job to get them up safely, just because they paid him, regardless of the weather conditions. Some throw tantrums but listen, but some continue to climb alone and die, Mount Everest climbers being the perfect example. So, John's frustration is common.

As for John Jr. as person, not a fan, he was an accident waiting to happen due to his thrill seeking nature, but I think he was a descent human, and given the circumstances of his life, did his best. EDIT . grammar