Some ideologies are, in fact, mutually exclusive and cannot tolerate the others. Fascism cannot be tolerated, for instance. Nor can a belief in chattel slavery as a universal good. Sometimes an opposing ideology is just too fucking evil to be allowed to persist.
Setting the line that must not be crossed is a hard no problem though. And misplacing that line an inch incorrect in either direction can be horrible too.
It’s not just the very ending, unless you mean the entire 2nd half… it just felt like there were two entirely different movies made, and they took the first half of one and haphazardly grafted it on to the second half of the other. The tonal whiplash alone was crazy.
I feel like that sort of movie mismatched has happened a lot over the years. I figure that producer meddling or overfitting to test-screening reactions is typically the cause.