Luffy,Ace,sabo,and kumi were all currently tied up to a tree."Since you little brats want to play smart, let's see how smart you will all be when I throw the three of you into a river,"said garp.
We told you old man we didn't do anything we were training on this island the whole time, " said ace.You four need to start taking this seriously if your identities are discovered you will all be sent to impel down and I won't be able to protect any of you.
That celestial dragon was dragging innocent people from their homes as they screamed and begged.You want to know what the Marines did they just stood their and watched.
Not a single marine did anything, yet their supposed to hold up justice that's just bullshit!shouted ace.Garp stood their dumbfounded.
He had always hated this fact but couldn't do anything about it.
It's much more complicated than you four think." said garp with his head down.Theb why don't you try to fix it? Aren't you the hero of the Marines."countered sabo.
You think I haven't tried!"shouted garp.The four were shocked by garps outburst, and the look on his face it was pure rage.This rage wasn't directed at them it was directed at the Marines the celestial dragons,the gorosei and most of all himself.
The celestial dragons for their treatment of innocent people.The marines for assisting the celestial dragons in this so-called God's work and also turning a blind eye to it.The gorosei for giving the celestial dragons the power to do so and himself for not doing more about it.
"I've tried many times, and so did your father luffy, but we've both realized the world government wasn't going to change without overthrowing them.
Your father wanted me to join, but we both realized that it would cause huge unrest in the world if the Marines greatest hero left the Marines and joined the revolutionary's.
Pirates would start becoming more rampant. The Marines who wanted to help the people genuinely will lose faith in the Marines, either becoming corrupt or become Pirates it would do a lot more bad than good for the world." said garp as he stood their looking at the ground.
The world is a lot more complex than you think. Even though I wanted to try and change more, I just couldn't.said garp as he walked away.
Luffy already realized that garp couldn't do much to change the world government.It not he didn't want to, but anything he did could disrupt the balance of the world.
It's for the same reason he couldn't save Ace in the original.