Perhaps we should be listening to the partners/families of aircrew more carefully, not dismissing such things as 'spite'. Examples of which there are more than a few would be those who live under the constant threat of "if you upset/leave/don't please me you'll have the deaths of n passengers on your conscience if I'm not rested, happy and calm when I report for work". This kind of emotional blackmail has many permutations and while most pilots would have no intention of carrying out the veiled threat and use it 'merely' to control their partners, how would we know unless we listen and act on it whenever we hear something similar?