If those accidents happened in the UK then the AIB would investigate and look at the chain of events that led to the accident - just because the pilot is at the end of the chain doesn't mean it is the pilot's fault.
Shields down, please. It's not just the AIB that looks at a chain of events. Rest assured that the NTSB evaluates both causal and contributory factors as well. In fact, a sister thread here has posters banging on about how texting caused an accident, when the NTSB clearly stated the probable cause (fuel management and inability to perform an EOL) as well as contributing factors (one of which could have been texting).