1. People deserve to be free, despite the color of the skin, gender, or sexual preference.
2. We are humans and are all equal, using someone as a slave hurts humanity, more importantly, hurts the person who's serving as the slave. That person could potentially become someone important to the world, holding them in captivity could make us miss out on something special.
3. It hurts the nations. These debates about slavery never gets old, insults are common. People have different views on them, and therefore hurts countries politically and create drama that's not worth the time. If we abolish slavery, we won't have to worry about that issue. That would be one less headache, and one less heartache. .....i dont have any more reasons...