I think you mean Muslim's do a lot of things Islam disallows.
Islam does not disallow slavery. Eating pork and drinking wine even in moderation is haram. Keeping sex slaves is halal.
And since this is in the Quran, Muslim societies can never make slavery haram. And this is one of the examples why holy books are bad for guiding morality.
Obviously you are still confused over things as to how they were in ancient Arabia to life today unable to understand the cultural aspect back then.
I am not talking about culture, I am talking about rules in Quran and Sunnat which are supposed to be guidance for not only ancient Arabs but for all peoples of all time so don’t use that bongi argument with me.
Arab's are the most racist people in the world that is a separate issue.
If you reads prophets biography then you will see that even the Pagan Arabs of the time were horrified by the barbarity and Tyranny of Rasullah and his followers. Entire tribes were exterminated and their women sold in bazaars at whole sale, it makes ISIS look like a charitable organization.
Similarly the ISIS, Taliban or any such group are mostly illiterates fighting what they consider to be war's of liberation.
They are doing the same things that Rasulallah did as he is their role model and guide for all times.
Have you read their statements? Every action they take they provide justification from it from Islamic sources.
Your prophet and his companions burned people alive, stoned them to death for adultury, executed prisoners of war both active and civilian. And sold off their women as sex slaves in the market. These people just take the religion more literally and seriously than you do. Ignorance is not an argument.