*Reports from various countries indicate that living
apart from a mate or children in order to work
abroad is a factor that for some has contributed to serious
problems. These include infidelity on the part
of one or both mates, homosexuality, or incest, and
among children, increased behavioral and academic
problems, aggression, anxiety, depression, or suicidal
tendencies.
April 15, 2014 WT Sunday 6-22-14 Study Article
I think there are 2 points; the WTS knows of judicial matters where this is said to be the cause...but what is more likely is these problems already existed at home but the individuals felt safer indulging in the sin when anonymous and away from home. Most incest happens at home, children being molested by parents. BTW incest does not include other forms of child molestation of non-family members. So how does incest happen away from home unless the child is with the parent.
King David committed adultery and murder because he had come home from the wars....not because he was away from home.