I will say this is true. If you grow up, especially as a Black person in America, you are taught that the worst crime ever perpetrated by American was slavery and the subsequent discrimination against Blacks.

So it is hard for Americans, especially some Black Americans to understand that Allah(swt) allowed slavery though he regulated it, and enslavement is an appropriate punishment for enemies of the deen.

People don't understand that slavery as it is regulated in Islam is a whole universe away from the brutal methods practiced by the european kuffar. However, Slavery is not intended to be pleasant. Allah(swt) legislated that slavery is a punishment for kafir enemies who choose to fight against Islam rather than accepting the deen. Fighting against Allah(swt) and his religion is a terrible thing in the sight of Allah, so he has proscribed the punishment of hellfire for those who die fighting against Islam, and he has proscribed the punishment and humiliation of slavery for those kuffar who survive and their women and children, as well as the seizure of their property.