Slavery is a muggle atrocity, because they think that the colour of a person's skin is more important than anything. We don't. Pureblood is pureblood, it doesn't matter what a person looks like.
We don't go to war. Our international treaties make sure of it. There hasn't been wizarding involvement in a war since before the secrecy laws.
I don't know why you're lying to me. Is it because I disagreed with you? You might have just said you didn't want to write to me if you thought it was terribly insolent of me, I'd have left you alone. That lie is worse, though. You oughtn't to.