Well, believe it or not, as dear old Ripley would say, slaves in the muslim world are not an economic resource, but chattel to be used, abused, and disposed of. Slavery in the US was based on this muslim perversion of the long standing use of slaves as a mutual economic resource.
Nothing in the muslim world make sense to Westerners - which is why their horrible countries and their atrocities are excused by so many, why jihadis are said to be a minority when the truth is otherwise, why there are ‘moderate’ muslims - Westerners simply so not understand because they attribute Islam to some form of Christianity - which it is definitely not. Most Westerner refuse to read the 5 holy books of Islam and tend to get upset when someone who has describes what is in them.