According to her statements it seemed to have been a continuing topic of conversation over time that his family were going to meet their fate somehow.
Had it been a one-off then I suppose it can be passed off but circumstances dictate that to kill was a regular occurrence every time he opened his mouth.
Moral ? I call it criminal. She knew his feelings on the matter. I couldn't go out with someone with death on their mind, could you ?
It seems to have taken hold/escalated the previous Christmas, but whilst it was a "continuing topic of conversation" we can't know if it was on a daily basis. It wasn't as if they lived together 24/7.
Yes, a one-off could have been over-looked. More than that, I think I'd have been fearful for my own safety. I wouldn't, for any length of time, want to be around someone capable of that depth of hatred. Naturally, these days, I'd probably suggest a course of therapy....................just before I left!