I think slavery was a necessary evil
Why do you think that way?
You know what? I've said everything I need to say. I'm not gonna waste my time discussing this if you don't agree with my opinion, jerk!
Removing people's rights, making them work without pay, and treating them worse than an animal will never be right in my book. It's not a necessity for us to think that we needed to experience those things just so we would know that they are evil deeds or they are not the right thing to do. I would definitely recommend you to think about the experiences that these people have experienced before saying that what happened to them was necessary because it's definitely not.
I don't want to go through this debate again and having to explain my opinions.
Being close minded to see other people's view and willing to admit that your opinions are wrong is a sign of non intellectual person.