I would not argue the civil war was fought over slavery, but instead how southern states want slaves counted both ways, as slaves, keeping them as slsaves, property, and as people to help with representation. The point is, we sadly were not as opposed to slavery as we should have considering our rethoric concerning freedom.
As for feelings, we all have to look back on our past, and we're likley to have feelings about it, be it our personal past or our national past. It is merely human nature to have feelings. I've done things I wouldn't change that I feel bad about, even though I learned. I suspect I'm not alone with that type of feeling. This can be true concerning our nation. We've done things as a nation we should not feel proud about. And it is good to have those things see the light of day and to remind ousrselves that we can do bad things. We're human, not perfect, and if we don't pay attention and stay vigilant, we can do wrong in hurry.
And what you ask be taught is what is taught. However, you seem to be asking that it be taught with a more positive spin, meaning to me that perhaps you can how you feel about it. I could be wrong of course, so I'm not saying I know this is the case for sure. But there really isn't any significant hysteria to any measurable degree.