Technically the dragons invented aerial warfare, I just improved it. And I'm not happy it was necessary, but the problem is that it was necessary, if just to protect others.

As for Berk? What Toothless and I did stopped generations of war. As much as I don't want Berk to be attacked, at the same time I wouldn't change what happened even if I could. What I will do is fight to protect what we have, and I doubt I'm the only one who feels that way.