In modern Christianity, especially at the denominational, seminary, and publication level, those advocating for social justice point to the abolition of slavery as the great victory of the church for justice in society. It's hard to argue with that. It was a battle largely fought and won by Christians, with William Wilberforce of England and the Quakers, Congregationalists, and many Methodists in America being the most frequent mentions. Students willing to go deeper can find Catholics dating back to the 2nd C speaking against the practice, though more as something to be discouraged among Christians than made illegal. Ideas like that were gradually introduced later. Abolition seems an unarguable good, even if it is not the only possible good in the world.
There have been other causes taken up by the church with a definite eye toward establishing justice in the societies where they lived. Educating women, conditions for prisoners, and the centuries of feeding the poor and attempting to provide medical care or comfort to the disabled or dying. But slavery has been the big-ticket item all concerned with justice point to.
I was saying aloud to a friend that it seems the more recent causes are more ambiguous and difficult to achieve and one of my own cliches occurred to me: When there is a great problem, the first solution picks off the low-hanging fruit and solves, 50, 70, 90% of the problem. After that there is increasing effort for lesser returns. I suddenly wondered if getting involved with Abolitionism was not a Christian opportunity, but the bait, the temptation to turning aside from the Church's main goal. View in that way, it looks an awful lot like Satan'[s third temptation of Jesus, doesn't it. Was it that same temptation, offered by the Devil this time to the Church - and we swallowed the hook? It's a chilling thought that clear ggood could disguise evil in that way. Except that is what spiritual temptation means, isn't it? Some desire to do good, as Gandalf feels for possession of the One Ring that carries an addictive poison that is ultimately fatal?
Abolition is ultimately not a mercy or charity issue, nor one that has eternal consequences, after all.
Any idea that is this new I don't offer as any claim that it is true. But I do offer up that it might be true, for your contemplation.