You could ask all of those questions about the Empire and the Emperor in the original trilogy, and until the prequels came you didn’t have answers.

Again, he’s not less fitting than Emperor Palpatine. We still don’t understand how Grand Moffat’s Tarkin came into power, or how he outranks Vader.

We don’t need to know any of that information. We have characters asking those same questions you’re asking, Leia was suggested to have created the Resistance because The New Republic didn’t take action or the threat of the First Order seriously. We could also ask why the Galactic Senate allowed the Emperor to disband them, and give power to the regional governors. How did the Hutts gain control of certain systems? Why didn’t the Old Republic take action to prevent the Hutts and other crime syndicates from rising to power?

Fill out all of the Wookieepedia pages! That’s all that matters! 🙄