Secular morality is based on necessity rather than empathy, therefore those who adhere to it have no place criticizing the morality of anyone else.
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Humans determine morality based on perceived necessity. Slavery wasn’t widely considered evil until the economy no longer heavily relied on it, and the main advocates against it were people from the parts of the country which didn’t rely on slavery whereas those in favor of it were from agricultural parts of the country which heavily relied on it. This is also equivalent to how humans view animals. Although no one would argue that enslaving, killing and consuming animals is not evil and wrong, we humans still do it en masse because we rely heavily on it. So just like we don’t think twice when enslaving, killing and eating animals because of how much we feel like we need to do so, people of the past didn’t think twice when enslaving other humans because of how much they felt they needed to do so.
But this raises a problem, it means that since the same people that condemn slavery enslave, kill and eat animals, they have no place to condemn really anything at all if they can’t even be consistent with their own morality