I think your conclusion is upside down. Air safety is based on the "Swiss cheese" model. Multiple layers of safety nets are in place to compensate for issues in one layer. In particular, technical safeguards are there to prevent disasters if the human in the loop makes a mistake which will eventually happen. Any weakening of any technical safeguard makes the system less safe. No matter if the human ultimately made a mistake -- the technical system failing contributed to the accident just as much.