Right then, I will start by saying that any death is a tragedy and I do have compassion for the families involved.................but.....
The two pilots broke 2 significant rules, the first being flying whilst under the influence of alcohol and the second flying IMC without training or qualification.
The matter of vacuum pump failure is incidental.
I would imagine that had the two pilots lived then they would have been charged with the manslaughter of the female passenger. She was probably not qualified to assess that the two pilots were well outside their personal and legal limitations and had to trust them completely to provide her with a safe passage.
Lets not get too precious about this. They broke the rules on two significant counts and on this occasion it cost them their lives.
During my flying career I have met too many people who 'get away with it'...............this proves that does not always happen.
It is a salutary lesson to all.
UTF