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In fact, I can think of several factors like that: alcoholism, drug addiction, anger management issues, clinical depression, chronic diseases, etc.

And potentially that men (and women) may react a certain way to unemployment that makes them difficult to be with.

If there is a third factor, that doesn't stop anything else from being a factor.

Yeah, if the husband is emotionally unstable that could lead to both things.

The very word 'factor' requires there to be more than one. A single thing can't be the factor.