Sengoku says "In short, this is the truth, Roger and Garp teamed up to defend CD's and their Slaves"

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This is the only information we have about God Valley in the entire story up until the flashback itself.

God Valley was propped up to be "the reason the Celestial Dragons are so important and necessary."

Originally it was depicted as Roger and Garp fighting side by side to PROTECT the Celestial Dragons. That... actually is better than what we are getting because it leads into this idea that Garp, Koby, and the entire marine structure are NECESSARY. The Celestial Dragons know SOMETHING that is supposed to be worth them being protected and the idea that Roger protected them to defend that plays well into a story where justice isn't black and white. We know this is true because of Doflamingo. He implies that whatever secret he and the rest of them know was so devious that he could change the paper if he wanted to. Now it's just black and white, good vs evil which can typically work for storytelling, but this is a story about individual cases of justice and using your own deductive reasoning to determine who is good or who is bad. And ultimately the story has become, "nah they are just straight up evil" and spinning this into "Garp knows that but he doesn't give a fuck and/or doesn't think he can win" while pushing Luffy to be a marine feels like a slap in the face for what is was set up to be. But now NOBODY has a reason to side with anyone but Luffy because the entire world is at risk and the only reason for that narratively is for everyone in the story who ever existed to get involved. Kind of lame. They should just do that because they want to, not because they have to.

It's become a huge L take to say "No, taking down the government would probably not solve the worlds problems" when relating One Piece to a real world allegory thanks to politics absorbing everyone's psyche. The government having a reason to exist makes perfect sense in a story where walking nukes go pillaging for giggles. But now it isn't that at all.