Thats a retarded reason. You think someone like Luffy will be pissed of and mad just because of learning ancient history?
You sure you know how Luffy acts?
Luffy cares about his crew, he isn't a revolutionary.
Thats exactly why it makes sense why One Piece is over with finding One Piece. I don't see how Luffy will be motivated after learning ancient history, Luffy doesn't read even 1 book in his life now he will declare war by learning ancient history?
Government is already in war with SH pirates at this point.