It feels odd pointing out Mackenzie's lack of agency in taking her new job as a shot at the show and then completely ignoring how explicitly Maggie exercises her own agency in turning down what Jim assumes is a better job to instead pursue the job she wants.

While the "why" of the murder isn't really discussed, that doesn't make it all that irrational. Perhaps his story had a grain of truth in it; perhaps she was going to leave again (their first breakup was short, they got back together). He wouldn't be the first husband to murder his wife after finding out she planned…