What happened in the last few pages, now it is a poor FO who was bullied by his captain and we should find blame elsewhere?
Get real guys, this character willfully locked the captain out and decided to play kamikaze.
If he wasn't some young kid whose license was barely dry buying a job with a loco as so many others do here we wouldn't be having this conversation and the 144 passengers would be sitting home with loved ones.
There is only one person to blame here, the FO.