Maddie dear, I really think that this is stretching things a tad.
An attempt to do just that will be in one of the most important of the new crop of Darwin books: Darwin\’s Sacred Cause, by Adrian Desmond and James Moore, published next month. They argue that Darwin was driven by a moral impulse – abolitionism. He set out to prove that all human beings, regardless of skin colour, were essentially the same, all descended within a few thousand generations from shared parentage. It was Darwin\’s refutation of the scientific racism of his day used to justify slavery.
Darwin published in 1859. The slave trade was abolished by the British in 1807. Slavery itself outlawed in the British Empire in 1833. Even the Americans banned the importation of slaves in 1808 and, well:
Between 1808 and 1860, the British West Africa Squadron seized approximately 1,600 slave ships and freed 150,000 Africans who were aboard. Action was also taken against African leaders who refused to agree to British treaties to outlaw the trade, for example against "the usurping King of Lagos", deposed in 1851. Anti-slavery treaties were signed with over 50 African rulers.
Darwin may well have been writing about, campaigning for, other things than simply his revelations about evolution and natural selection (that latter being really his point) but I really don\’t think that trying to change public attitudes to slavery was one of them.