Alright I'm gonna have to play devil's advocate here, poor guy already has a broken hip and had the balls to film that shit and put it up for everyone to understand his mistakes, no need to literally kick him when he's down. There are a lot more people like him (most of us when we started), he got a job at a tree service and they put him in the air before he knew everything that he should have. This forum is blessed with the very people that actually develop, test, and advance gear and cutting edge techniques, but most people who cut trees are trying to feed a family and haven't attained that level of mastery yet (me). If you watch his earlier videos, you can actually see the first tree that he ever climbed, and he did so at work with a chainsaw. That was roughly a year ago, and while his climbing skills have gotten much better, I bet he still hasn't been trained in rigging or anything else. He is self taught mainly (I'm basing that on the fact that about halfway through his videos he suddenly adopts advanced gear and stuff), as am I and probably more people here than would like to admit. I don't think he has a cavalier attitude towards safety, he has made mistakes and didn't know the risks. He was trying his best to do his job, but his employers didn't train him enough for him to do that safely. In my opinion and experience most people get hurt because they haven't learned the job fully. I personally have been very lucky, and I think most of us could look back and say the same thing.
Murph, I admit that you have more experience than I will ever have, and I have learned tons from you from the stick trick to the snap cut for a back cut in order to get to safety before pulling a tree in a bad spot. But even you have experimented with stuff that is outside safe practices, the intentional barber chair thing comes to mind. No one is perfect, and tree work is very dangerous compared to some other lines of work. Every time we fire up a saw, we are betting our life that we have the knowledge and skill to survive the task. Everyone who is going to attempt this needs to understand the commitment level that tree work is. Most people who end up hurt don't understand the risks involved before it's too late. Tree work is very similar to pipefitting in that regard (my day job), people often know just enough to get themselves hurt or killed.