The very best, most moral movies are not sunny, happy "watch this guy do good!" movies but those showing people in moral dilemnas. The opposite of a dramatic situation is one in which the "right" choice is plain as day and the hero makes it without reservation and that's it.
The essence of drama is conflict. The best conflicts come from inside the hero--"man in conflict with himself". Movies about such conflicts that show someone making decisions that some people will agree with and others disagree with, in which the hero is conflicted even after arriving to his or her decision, are potentially the very best dramas.
I enjoyed much of Mystic River, but found the drama bungled by the end--SPOILERS AHEAD--he "right" choices are plain as day, and the climax is more about certain information not getting to certain characters, and the evidence that puts one character on the spot is pretty lame (the night one character gets killed just so happens to be the same night another character kills someone for the first time in his life? Uh, yeah...). Having said that, the feelings that come out as a result of Penn's suspicion and Robbins's decades-long anger are powerful.
END SPOILERS There's nothing like that in MDB. There is no way for the character to hide, he has to make a tough decision, and sacrifices his own moral code out of a complex love for another character. THAT is the essence of good drama.
People who change their moral points of view based on a freaking Hollywood fictional movie are probably too stupid to know how to vote, so I don't know what all the whining is about. As I wrote before, the same people probably have no problem watching Mel Gibson shoot up thirty people a movie and don't get all bent claiming a Lethal Weapon movie is "advertising murder".
Thank God you're here. I've been trying to say that on another thread, but not as well as you just did.