It's complicated - I don't think you're wrong but I think it would have pained him to do it. You see with Graduation Day 2 he was genuinely upset by her suffering and in This Years Girl we see he took time before the Ascension to record a tape for her and find her a powerful artefact so he did think of her even if it was egotistical and manipulative to say without me you're effed. I think part of his patriachal nature made him desire to have children or pupils to be a mentor or father and Faith kinda forfills that need in him even with Mr Trick they banter. The mayor I think genuinely enjoys people's company on some level he just thinks he's superior and that he deserves the respect due to him and that humanity needs to be controlled and ruled. He's kind like Himmler who in spite of being evil was by all accounts a great dad. Ironically he did such a good job with his kids they all rejected his idealogy and his name recognising it for the poisonous shite it was.Hmm...the Mayor is a tricky one. Essentially, I feel he is using Faith and only comes to treat her well because she is the most useful to him. Faith, being desperate for some kind of deeper connection to someone is, I feel, the real driving force behind this relationship. However, that being said, the Mayor's actor, much like Spike's, was really really good at his job, and he walked a fine line between genuine affection and simply using a young girl. Simply because we do not get a longer story or redemption arc for him, I feel he liked being evil, was perfectly ok with it, and would have dispensed with Faith if she had ceased to be useful to him, thus breaking Faith's heart. Honestly, though it could have gone either way with him.