I can't get myself to like this movie because I don't think there are compelling reasons to be sympathetic or empathetic to the protagonist. The protagonist's rationale for killing people is that they are uncivil, impolite, barbaric, nihilistic, and lack good manners. Notice that he *kills* people because they are *uncivil*, *barbaric*, and lack *good manners*. The very act of killing people because of their vices ironically tells us that the character, in his own way, possesses those same vices too. There's nothing civil, good mannered, reasonable, and mature about killing people too. On the contrary, it is uncivil, ill-mannered, irrational, and barbaric. If this were to happen in real life, we would all think that the protagonist is some kind of psychopath and extremist than a profound social critic. Now, I know this is just a movie, so perhaps i'm overreacting. But consider this: it appears that the maker of this film wants us to *listen* to the protagonist's message; he wants to convey his message through this protagonist. But It's not obvious if there are any good reasons to listen to him if he is denouncing the very vices he has throughout the entire film. Moreover, there's more of a reason to ignore him.
Now, this doesn't mean I disagree with everything about the movie. On the contrary, I agree with the underlying message behind the film: society is becoming decadent. There's a decline of civility, rationality, and quality. Any debate is vulnerable to partisanship squabble that takes away those virtues quite easily. People are becoming more inconsiderate, self-entitled, and narcissistic. And yes, religious extremism on the right is at least tolerated by our society despite their abhorrent behaviors. What this movie probably does best is it reveals our secret desire to just beat up or terminate these people who cause these problems. But notice that you can't have it both ways: you can't have a character satisfying our latent blood thirst and preaching the message we all want to hear. Because that would be a contradiction and a hypocrisy; irrational and immoral which are the very vices the character is preaching against.