Just because a way of a story doesn't mean it has to not have all evil dragons, there can be good and bad.
That's not how it works. The dragons are hate YOU. The Dragonborn. They're not evil or good. Things aren't black and white like that. To you, the dragons are evil. To them, you are evil.
We won't be riding dragons, and I'm glad. I guess lore doesn't matter to you?
Edit: ...so from what I gather, you (Hero) NEED to have a mount to make this game worthwhile? Wow...