story
You can disagree with their decision whilst still empathising with their reasons. Indeed you must, if you're ever going to persuade anyone to change their position.
Though you're poisoning the discussion by invoking cannibalism, it's easy to see that in primitive societies where it was accepted, it was due to a need for safety (from hunger) and love (from participating a communal ritual). Of course we find it abhorrent now, I certainly do. But I can understand why it would have been acceptable to people in a time and place where there seemed no alternative.
Equally, we would all hope and expect that where others find our opinions and actions abhorrent (and in a huge and diverse world, someone always will), that they will seek understanding before abusing or marginalising us.
> PS: Some people really don't care about safety others don't care about love.
When I've actually dug deeply into that question, I've never found it to be true. The people who, on the surface, seem not to care about being loved, actually turn out to be the ones who crave it the most. Just look into the life story of any psychopath or tyrant, and you'll inevitably find stories of abuse and/or emotional neglect in childhood.