User blog comment:IamJakuhoRaikoben/Chapter 356: Tartarus Arc, Review./@comment-5343732-20131019064909/@comment-7418318-20131021173149

The problem with that otherwise nice theory is that Silver works together with other demons.

If he unilaterally hated all demons, he'd try to kill the other 8 of the Nine Ghost Gates.

And for him to bide his time for the ideal moment to strike, too much time as passed since the death of his wife.