Precisely.
What is particularly loathsome about this case is that Terri's misery is caused by Michael, Felos, and Greer. She would actually have a pleasant life if she were allowed to live with her parents. She seems to have some concept that there are people who are nice to her that she likes, as distinct from other people who are not nice to her. Even if she was never able to understand 95% of what's going on in the world, if she were with her parents she could enjoy the warm breeze of an April afternoon as she listened to birds singing in the park. Although I would certainly hope that her condition would improve considerably with therapy, I don't think it would have to improve much if at all to allow her a pleasant existence if she were freed from the monster who, when convenient, claims to be her husband.
I like your last line especially. It's worth repeating! Michael is a monster, but claims to be Terri's husband only when it's convenient for him.