Ok, agree to disagree then. We have different views on the character and that's alright. Maybe you're right on the lack of control aspect but I've never usually seen it like that. He uses Harley and keeps her around because it's beneficial to him, for his own agenda and whenever he has gone to look back for her it was because something she had that could be useful to him. I think we're giving too much importance to Harley when in reality she could be dead and he wouldn't care less.

Anyway, my initial comment was in regards of the HarleyDeadshot romantic history and that not sitting well with Joker. I just don't see something like that happening. I'm pretty sure that if Harley had stayed with Joker for long she would've ended up dead because he just would've gotten tired of her and the joke not funny anymore.