And I want to know what happened to our world beyond 'we created a curse'. What did we create? How can we keep ourselves from accidentally recreating or triggering it again?
What's to stop you to research it? The only one putting limits was Mr. Potter and he's gone. With people doing what they want, you're pretty free to do it.
And that's really the point for EVERYTHING. Now we're at the whim's of what each person's want and we feel the consequences from the castle. I'd rather live in the Muggle world or see if I can make my way to the rest of Europe that rely on people here doing what's right.
You keep making assumptions and then saying 'I said nothing'. Well, if Muggleborns shouldn't be here, I don't see why you brought them up in the first place. Also the WORST that can happen to them without knowing about magic is that they are a basket case, so basically like almost everyone here. At least they aren't at the mercy of an inanimate object.
It's going to be better because we'll be HAPPY and we won't have to deal with anyone we don't like, because being tolerant isn't the same as liking or being happy. Also you might want to stop reading books and you'll see that most people don't want to be with each other.
And again NONE of that stops us from going to Hogsmeade or Diagon Alley. Whowever wants to stay together can stay and whoever doesn't want to can leave instead of being here.