You can't reason with people who are getting rich off hurting other people.
They already know they're wrong and don't care. Their only response is to try to conceal their crime under a cloak of righteous humbug.
Slavery has always been with us, but when it became incompatible with Enlightenment values, the attempt was made to justify it with religious and patriotic excuses.
The ancient Greeks had a word for it, ὑπόκρισις.