No one knows the variables besides the two up front, their fleet manager and a few other 'need to know' bods in BA. The same can be said about the Ryanair incident in MAD last month. People should learn not to judge on things that aren't as clear cut as they may initially think. I doubt this is a clear cut incident, much like the FR guys who diverted to VLC.
Think before you judge, for the sake of the crew. Put yourself in their shoes. How would you feel if an incident like this involved you and shortly afterwards you had to listen to others being so high and mighty over your actions. It would be bloody annoying wouldn't it?