Amtrak over speed derailment - blame engineer or management?

Should blame be allocated to the engineer?  It was his job to keep the train at a safe speed. Right?   Was there a back up engineer?  How much blame goes to the back up engineer?   

Or should the blame be placed on the management?     The management knows that human engineers  have issues - heart attack, texting, stroke, two jobs, Germanwing syndrome - issues which will result in accidents that kill passengers.    

Long sections of the Northeast Amtak corridor already have Positive Speed Control as reported by the NYTimes here [1].    The safety technology is available and has been for decades.   

In my opinion, the management killed the passengers....