I don't know about a 180, I see it this way:
Ra's al Ghul showed Bruce a Mountain: Courage, Fear, Trust,Criminality, Morality and Acceptance. For Ra's if the mountain is too challenging or someone gets in the way of reaching the plateau you either, bring the mountain down to a size easier to get to, or kill the person in the way. Bruce's method puts him on top of the mountain without the treachery.
The Joker wanted to show Batman that the mountain he prides himself on is a farce and at best a slippery slope that'll fall out from under you at the first sign of danger or harm to oneself and to illustrate this Joker set off an avalanche on Batman's Mountain and everything came crashing down. Joker wanted to prove to Batman that at the end of the day everyone would catch themselves instead of trying to save the mountain. At the end of the day Batman becomes somewhat of an Atlas figure instead of saving himself he catches the mountain and holds it on his back at sacrifice to himself.
Bane (I think) is the villain who'll add the final straw to the Camel's (Bat's) back. Batman has saved the mountain but, Bane comes in and adds a new weight. Destruction, desperateness, anger and fear. For Joker it was somewhat of an ideology for Bane it's a practice. Joker insisted if you push people far enough they'll fend for themselves at any cost, Bane seems to insist if you push people far enough they'll lose all morality and become the enemy, willingly. They'll turn on whomever is doing better than them, jealousy morphs into errant righteous indignation. If you take the system which tells everyone that they have chance and break it so that it tells a large amount of people they'll never have a chance, they'll band together with whomever and however to be angry to show total aggression to a stance that is against them and furthermore you can save people from death and depths of darkness but if they're living on the fringe they won't be appreciative. That a hero is only as heroic as the people he or she serves.
If Gotham falls Batman will ultimately fall because he is Gotham and Gotham is he. So to break the back all he needs to do is break Gotham.
Not have people hate Batman...no they hate Batman for a moral reason because they think he killed Harvey Dent and 5 people, though wrong in this information they're anger towards it is of positive moral fiber. It has to be bigger than that...
If you take Gotham and make them hate just to hate. Hate of jealousy and fear then Batman a logical extension of Good in the city is diminish over time until they both turn on each other.