Oda did it multiple times but People refuse to believe it just because WG have Superiority Complex, as if Pirates aren't Bad as well
It's not the Rulers who are Evil and it's not the Rebels
It's the Outsider!
The Moment Doflamingo said that Nefertari Family were among Founders of WG, People should have realized that They aren't the Evil Faction, cuz it means that Nefertari Family chose to Ally with other 19 to Face a Greater Evil
And someone might say, well maybe They did & then Regretted it, right?
If that was the Case, Nefertari Family wouldn't Create WG after the War was over, History wouldn't say that there are 20 Founders.
This shows that Nefertari Family never considered WG to be Evil or The Alliance to be Evil
Their only Issue was with The Land of Mary Geoise (Which Existed before WG)
Also if a War lasted for 100 Years, while the Continents were Sinking, that means the War happened on Red Line
It clearly turned Red from all the Bloodshed that lasted a Century
And this War over Land was already shown in Skypiea Arc, where Shandians & Skypieans Fought for so long
And neither of them can be considered Good or Bad, cuz Shandians were Fighting for their Land, but Skypieans also cannot let such Kingdom exist in the middle of their Turf, it's like They both had the Right to Rule that Place
So Joy Boy Side is like Shandians & WG Side is like Skypieans
The True Villains of One Piece are their Equivalent of Birkans, an Outsider
If WG's Symbol is Western Dragon & their Greatest Enemy picked Eastern Dragon as his Symbol
Then Main Evil of One Piece are those who represent Third Type of Dragons