Hi,
The overall "system" is aircraft + pilots. Maybe as the engineers have sought to decrease the failure rate of the aircraft, this has lead to airlines dumbing down the pilot side of the equation to reduce cost but keep the overall same level of risk.
Note that this amy not be a concious decision, and the effects might take many years to notice in the accident stats.
Seem's we have already enough statistics from a long period of time ...
The stats are:
+ - 70 % accidents = pilots errors
The other 30 % can be attributed as human errors (bad maintenance .. bad materials .. bad systems or designs ) and some act of God.
So .. the 70 % ( the most cases) can be reduced at least by schooling and training
Edit:
BTW .. all Airbus accidents so far are due to pilots errors
