Earlier quoted context omitted.
British paid out slave owners and abolished slavery decades before the USA did and without killing 1.5 million people. Sometimes it is better to pay out an injustice.
The US civil war was primarily over different modes of production, not slavery directly. The British working class was forced to pay the former slavers until a few years ago, while the former slaves got nothing. That was in no way just or good or useful.
https://www.battlefields.org/learn/primary-sources/declarati...