I can't vouch for the whole book, having not read it, but Individualism and the Western Liberal Tradition: Evolutionary Origins, History, and Prospects for the Future by Kevin Macdonald apparently has at least one chapter on this topic according to this blog, which states:

Kevin MacDonald is one of a few evolutionary psychologists who understands that whites are singularly altruistic outside their kin-group, and that explaining this behavior requires a Darwinian approach that is wedded to the history of whites. This is the subject of chapter 7 of his book Individualism and the Western Liberal Tradition. He argues that the “moral idealism in the British antislavery movement”, which led to the abolition of the slave trade in 1807 and slavery in 1833, offers an excellent case study of the nature and historical origins of white pathological altruism.

It sounds more academic than instructional, but maybe you can vet it if you find a pdf somewhere.