ph6, the crew made a mistake that cost not only their lives, but the lives they were responsible for as well.
So be it. It has happened before and it'll happen again.
The lessons learned seem to be though 'don't trust flight planning with your life (Collins seems to be the only pilot I've seen who didn't know this anyway), and 'watch out for sector white-out'.
Holding any actual 'responsibility' as PIC seems to have gone missing...