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“Always acceptable” can only be interpreted to mean in any amount, for any reason. That’s clearly sadistic and disturbed were it to reflect your true feelings. It’s the sort of nonsense a person says to themself when they refuse to allow themself to think rationally about a subject and actually reflect on their true feelings.
The animals we create are morally equivalent to our own children and are owed the exact same unconditional love and protection.
Animals are not morally equivalent to humans in my opinion, and morality is not rational.
You choose to draw the line around a select group of animals, I choose to draw it around humans only. Both are valid worldviews.