Yes, they did. The second one.
It's just that they didn't spoofeed it to you. No one was explaining word by word with philosophic borders on top... several times in the movie.
But you can see Bruce investigating about the Penguin just because he felt Penguin was a menace for the city - not for himself, for sure - and even Alfred was 'hey, why on earth are you so picky about this guy? you insecure? wanna be the only lonely man-beast in town?' Then Bruce - who lives comfortably in his house with lots of money and a free life, start to move wheels to stop Oswald and Max. Why? Because he was worried about the city (Max wants to steal power, enbergy and m oney from it) and the people in it (Penguin and his henchmen are proved to be a menace for people.)
If not for a bigger cause, he could have quit being Batman. And Bruce could live forever with his money, no matter how much energy Max Schreck can steal from Gotham. And since the Waynes' killer - Jack napier in this case - helping the city and its people is the only that motivates Bruce. Maybe Bruce himself is not even aware of this and he does it compulsively, but he does at the end. The bigger cause is there, no matter if our 'hero' is aware of it or not.
Then why Napier didn't wear colorful clothes and was laughing all the time and killing people with electric handbuzzers and poisoned pens? The smile is there just to show audiences that guy was a young Napier and then you go... 'Cripes! Waynes' killer is the guy who later became the Joker.'
The whole movie developes the transformation this guy suffers from jack to Joker. What can I do if you insist that he's just the same guy but now with a pale face.
In the sense that there are big changes that could have not been made, both movie have them. Each person would decide what he/she likes better. Me? I can dig both. Nolan, because it was very... uh... I hate this word already but I'll use it in a proper way... realistic, and didn't make me feel like it was a Disney-type hero. And burton made me feel this was a character beyond the childish label of 'superhero.'