Yeah, the guy, John Newton, later became an abolitionist (years too late for the slaves he had shipped, though...) and never stopped regretting the horror he had been involved with.
In his Thoughts Upon the Slave Trade (a historically important expose of the conditions of slave ships), he says,
"It will always be a subject of humiliating reflection to me, that I was once an active instrument in a business at which my heart now shudders."
You are the end result of a “would you push the button” prompt where the prompt was “you have unlimited godlike powers but you appear to all and sundry to be an impetuous child” – Zero, 2022
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In his Thoughts Upon the Slave Trade (a historically important expose of the conditions of slave ships), he says,
"It will always be a subject
of humiliating reflection to me, that I was once an active instrument in
a business at which my heart now shudders."