So let me get this straight
The Metkayina Tulkun whale managed to gather the other whales and regroup together to attack the humans who killed his mother right in front of him and yet the Metkayina clan considers him a murderer in spite of that? Also, when Tonowari said, "Killing no matter how justified also leads to killing", what he meant is that killing in self defense is bad even if it's justified? Sorry, but I'm calling bullcrap on that one.
Everyone is supposed to take risks for the greater good. To defend yourself and to protect others from those who kill your loved ones.
Look, I didn't hate the movie. I was baffled at what was established here.