What elements of slavery does he seem to think will most outrage his readers? ]?

I think Olaudah's writings were very detailed when he was explaining the details of how they were treated.  Olaudah used to be the son of the village chief in Africa. He was abducted and taken away from his family. During his abduction, he used to have this misconception of a good life when he was taken to the New World. However, his naivety made him realized that the life of a slave is never easy