Why does equiano blame the illness abroad the ship on the improvement advice of the traders?

Because the factor behind the illness was caused by the greed and thoughtlessness of the traders.

Explanation:

In his narrative book, "The Life of Olaudah Equiano" Equiano tells of his life in slavery.

When Equiano was boarded on the ship, he saw the poor conditions of the ship. The traders on the slave ships were 'improvident avarice'; all they thought about was their profits. The illness abroad the ships were caused due to small spaces, suffocating atmosphere, unbearable smell, and lack of food. The traders, to get more pay for slaves, would overload their ships with slaves in the small space, they were thoughtless about the living conditions of the salves and did not provide them food. But for Equiano, the traders were harming their ability by keeping slaves in unhealthy conditions. Because of this unhealthy conditions on the ships, slaves either died of illness or took their own lives.