In The Name of Allaah, The Most Merciful, The Bestower of Mercy.
Imaam Ibnul Qayyim [rahimahullaah] said:
“It is obligated on you to give detail and make a distinction, because unrestricted and general [statements] without clarification has indeed corrupted this existence [i.e. the world], and misguided the intellects and views [of the people] in every era”.
Al-Allaamah Saaleh Al-Fawzaan [hafidhahullaah] said:
There has to be detail explanation. The one who is not proficient in giving detail should keep quiet, because benefit is not acquired from his speech. And every time error occurs, its cause is due to an absence of detail explanation regarding truth and falsehood. There has to be detail explanation and distinction and not to mix up [affairs]. Indeed, it may be that there is something of truth and falsehood in an opponent’s statement, so all of it is neither deemed to be false nor truth; rather there has to be a distinction between its truth and falsehood. All of it is neither rejected nor accepted; rather a distinction is made regarding the truth and what is correct and the falsehood and error in it. And if you are not proficient in giving detail, then you should not enter into this field. 
In an article written by Ed Husain about racism, atrocities committed during the war in Sudan and genocide, he stated: For the Nobel Prize winning novelist Wole Soyinka, the unwillingness to confront Arab racism is rooted in the role of Arabs in the slave trade. “Arabs and Islam are guilty of the cultural and spiritual savaging of the Continent,” he writes.
The Ethiopian academic Mekuria Bulcha estimates that Arab traders sold 17 million Africans to the Middle East and Asia between the sixth and twentieth centuries. Yet, there is an almost total reluctance on the part of Arab intellectuals to examine their central role in slavery, past or present. Any attempt to confront persistent Arab racism is shouted down by appeals to Arab/African solidarity against the neo-colonialist West, a sentiment that seldom moves beyond slogans. Sheikh Saleh Al-Fawzan, a member of the senior council of Wahhabi clerics responsible for writing Saudi school text books, states: “Slavery is part of Islam. Slavery is part of jihad and jihad will remain as long as there is Islam. It has not been abolished.” [End of quote]
Indeed, the truth, falsehood and ambiguities in the above statement must be unveiled, and the precise response can be found in the following clarifications by Shaikh Abdul Waahid Abu Khadeejah [hafidhahullaah].
Islam’s Unapologetic Position On Slavery – Ustaadh Abu Khadeejah
European Slavery Vs Slavery In Islaam
[Ref 1: Source: An Excerpt from At-Ta-leeqaat Al-Mukhtasar Alaa Al-Qaseedah an-Nooniyyah: Vol: 1 page: 216. Slightly paraphrased]