Enjoying compelling TV about bad people is not the same as endorsing bad behavior though. But that's a whole separate issue from rooting for them. If you LIKED Walt at the end of BB I don't know what to say about that other than... that's fucked up?
I'm pretty good at separating fiction from reality, so when I say I like a character that does awful things, I'm well aware that I'm liking a fictional character that does awful things. And that makes all the difference.
I don't know man. I feel like the whole point of Walter White was that he could convince people (and also himself) that he was still a decent human being. Including the viewer. That to me was the beauty of BB. And everyone in the show that fell for it, had to pay the price in the end. It's like how the worst people in history are always the most charismatic. And in the end, those that fall for it pay the price. Not to say that Walt was such a charismatic person to the people around him. But to me as a viewer he was, because you could see a man struggling with his morality, time and time again he wasn't able to see how much damage he was causing. He didn't want to see. And so, I forgave him, again and again. And in the end you feel tricked, but as a viewer I really enjoyed that process a lot. Maybe that's fucked up. But it's fiction so I don't really care.