I think that this explains why Snow was so fatalistic in the pilot about the Dark Curse at the round table. I think that she didn’t feel that she deserved a different fate by that point. Only Blue arriving with the magical wood gave her new hope.
Also, IRL, ‘good’ people justify actions against others all of the time by demonizing them. People justified Slavery in the US by considering black people subhuman. People don’t want to serve gay people and are writing laws to that effect today ad calling it ‘religious freedom’. And they firmly believe that they are doing good.
In the Charming’s case, they knew it was wrong and justified it by demonizing the dragon egg.
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