And because it's considered routine, the real threat is lost in the shuffle.

Since morality is subjective based upon one's beliefs and experiences it is hard to paint with a wide brush when it comes to culpability.

You are assuming they would still have contact with their friends and close family, there is no evidence of that.. Even if they did,that doesn't biologically change what they have become, which is not human!  My dog behaves very human at times, but he isn't human.

The person is changed from a human into something that eats humans. It does bring up a difficult question about whether we can call a different species "evil" for going along with its nature but humans aren't going to like it.

Abuse is complicated and spouses often react in questionable ways, or what defies logic to someone not living under that kind of condition.  Remember this woman still loved or thought she still loved her husband in spite of what he was doing to her and her family.  That sounds twisted, but often the case, often the law is no help either, this is why so many abused spouses end up dead.  After the soul gaze getting the full picture, or a fuller picture of what was going on, and remember at this point Monica was still making a plea for her husband that he was once a good man.. While Harry did bring it to her attention that she should have told him everything when she first saw him, he understood and didn't hold it against her.