Why were so many people opposed to the institution of slavery?

Many people opposed the institution of slavery due to moral, ethical, and humanitarian reasons, viewing it as a fundamental violation of human rights and dignity. Religious beliefs, particularly among abolitionist groups, emphasized the equality of all souls and condemned the practice as sinful. Additionally, the economic arguments emerged, where critics pointed out that slavery hindered societal progress and innovation. The growing awareness of the inhumane treatment and suffering endured by enslaved individuals further fueled the abolitionist movement.