Why did the Europeans treat the slaves so badly during the middle passage?

They viewed them as property rather than as people

Explanation:

The Middle Passage was the stage of the triangular trade in which millions of Africans were forcibly transported to the New World as part of the Atlantic slave trade. Ships departed Europe for African markets with manufactured goods, which were traded for purchased or kidnapped Africans, who were transported across the Atlantic as slaves; the slaves were then sold or traded for raw materials, which would be transported back to Europe to complete the voyage. Voyages on the Middle Passage were large financial undertakings, generally organized by companies or groups of investors rather than individuals. Slaves' treatment was horrific because the captured African men and women were considered less than human; they were "cargo", or "goods", and treated as such; they were transported for marketing