Calvary is such a great movie that I'll never watch again (SPOILER)

First, please pardon me for my English, I'm not an English native speaker.

So finally I decided to watch Calvary, which I put on my wishlist for half a year but for some reason totally forgot about it until I went to imdb yesterday. Being a fan of McDonagh brothers' works, I had high hope for this movie and I'm happy to say that Calvary didn't disappoint me at all. However, unlike In Bruges and Seven Psychopaths, I don't think I'll watch this masterpiece again.

The story of father James was such a tragedy. He spent his life and time to delight people, help them escape from sin, yet his death didn't change anything. The people in the town (except the writer and the French widow) were still arrogant and vicious just like before. Nobody gave a flying fuck while the church was buried in fire, and after father James' death, everything remained the same. But their behaviour didn't irritate me as much as Jack's motive.

The reason why he killed father James doesn't make sense at all, but the problem is, it DOES make sense to him. A priest ruined an innocent kid's life, and that innocent kid ruined another innocent's life. Maybe from our perspective (and father James'), that isn't fair at all, but with Jack, that is totally understandable. For example, father James cried when he found his dog killed, but Jack (and maybe neither do the audience) just simply didn't care. When he asked father James if he cried when he heard about priests rape kids or not, he said no. Why ? It's because people who suffered from a tragedy knew it better than anyone else. If my dog died or was captured or killed, I would cry so much, but other people wouldn't, because they didn't attach to my dog at all.

This is why I feel so depressing after watching Calvary. Father James was a good person, he deserved a good life, his daughter just came back to him, he deserved to be able to stay with her longer, and it's so unfair for a good man to be taken his life away. I felt conflicted. I didn't know what to expect when his daughter met Jack. Maybe she would forgive him ? I think so, but in my opinion, he didn't deserve forgiveness at all. An act of crime is still an act of crime, killing a good person isn't karma. His action didn't change anything at all, and that made father James' death a waste. He died because of nothing, his daughter lost the final person who cares about her. It might be fair for one man, but just a tragedy to another man.

I don't know what to think right now. I love Calvary, but I also don't want to watch it again. I don't want to think about innocent people harmed for nothing, I don't want to think about forgiveness, I don't want to think about karma or fairness at all.