Regardless of the usual tone, I find this particular paragraph a fairly terrifying indictment of cockpit human factors across the board. Apparently it's not unusual for aircraft behave unusually with the pilots not understanding why - and the poor pilots "generally" blame themselves!
Aircraft have many states, and there is a lot of information to process to fly an aircraft, even in normal flight. When situations develop in real time, it takes a lot of mental horsepower to understand the situation and react appropriately. Despite all this, aviation is safer than driving a car.
It is one of the reasons I find aviation to be inspiring. Conscientious humans have mastered this unforgiving domain through effort and power of will. When you talk to a real pilot, there are certain mannerisms that they share that tend to show that the practice of flying really makes you a thoughtful person.