I dont believe killing him would be necessary,he isnt stated as an agressive mino(unless he picked Molly somewhere)but the bs Molly allegates is that who would ever want a woman after she was"bedded"by a beast?so she decides for living with the minotaur,in my opinion,if she simply chosen to live with the beast becuz she wanted to,them karma is a vindictive bitch....althought looking by the bigger picture,Molly simply seems like plainly dumb...it is sad,but in a medieval fantasy game,i would call that grim humour