At one level a mish-mash, at another a masterpiece. Who am I to judge?

Rating: 10/10 (20 January 2019)

I have seldom found myself so torn in evaluating a movie, nor have I ever so much felt the need to scan the comments of other reviewers.
My initial reaction at the end of the movie was that I had very much enjoyed it, and it would be an automatic 10/10, also that it would give me a lot of food for thought. Overall enjoyability and the ability to provoke thought are two of my major criteria, and I have stuck with my 10/10.
I did feel that its plot had more holes than Blackburn, Lancashire, and that was before I looked on a map of the USA to check up the relative locations of Missouri and Idaho, two states I have never visited (I am Australian) to discover that they are a very long way apart. I agree with all the reviewers here who have laboriously taken the time to list in detail the plot holes. I agree with all the reviewers who haved listed in great detail the very unlikely character behaviour of the principals, and the fact that they were not called to account for their greater excesses. I agree that the sudden road-to-Damascus conversion of one of the principals was the ultimate unlikely eventuality. But then, this was the USA, and if a blatantly corrupt mendacious imbecile can make it to the White House, surely anything is possible there!
But this movie also operates at a totally superior level, and I felt right away that I had been watching a parable. I had been watching the most sharply drawn contasts between good and bad, only to discover that few individuals in this world are uniformly the one or the other. We can all act well, and we can all act badly, and there can be a bit of both in every single one of us. Who are we to judge?
The brief scene with the priest made that point. We might assume that the Catholic church probably does some good some place, but it certainly does a whole lot of bad right here in our society. And when it came to the behaviour of others, who was he to judge?
The final scene in the car, heading to Idaho, with total indecision, everything unresolved, was the perfect ending to a perplexing parable. So un-Hollywood, so understated, so 'now go away and think about this'. And I have.
One footnote - all those complaining that the police chief's wife had a British accent. No, like me she is Australian. We talk different from the Brits, like Canadians talk different from USA folk. Get it?