Why was the slave trade abolished (full detail on why it was)

Since profits were the main cause of starting a trade, it has been suggested, a decline of profits must have brought about abolition because: The slave trade ceased to be profitable. Plantations ceased to be profitable. The slave trade was overtaken by a more profitable use of ships.

To water it down basically slave trade stopped being profitable. Plantations stopped being profitable. The slave trade was overruled to profitable use of ships.