[RX-78GP04G Gerbera]

It's similar to the whole Naruto vs. Madara/Obito argument about "true peace". Both sides are right in their own way, but also wrong.

Madara/Obito believe that only through brainwashing the whole world with Infinite Tsukuyomi could it be achieved and, in ways, they're right. As long as mankind has its individuality and freedom, there will always be differences of opinions, beliefs, cultures, etc, as well as mankind simply being a naturally competitive and greedy race, thus there is always a chance for those things to escalate to conflict, and then to war once again and it's been repeated countless times throughout history. Of course, Madara/Obito is also wrong in that such a thing could not truly be called "true peace" because it was completely forced on everyone and not achieved by the will of mankind. As compared to by Onoki, the Tsuchikage, it was be no different than Madara simply controlling the world as a dictator (being the one to cast Infinite Tsukuyomi, thus having total control over what happens in it).

Hell, one could even compare that to Gundam SEED/SEED Destiny with the Three Ships Alliance and their "interventions". While their goal of trying to get people to understand eachother and want peace is noble, they're going about it by SHOOTING AT EVERYONE WHO FIGHTS, so they appear a lot more like threatening people with a gun to their heads to make peace or they'll pull the trigger. Even Lacus herself admitted, "We call for peace, but with weapons in our hands", thus acknowledging that even she realizes the hypocrisy in their words through their actions.

On the other hand, Naruto believes that the only way to achieve "true peace" is through getting ALL of mankind to come together and "truly" understand one another. While such a result COULD be called "true peace", it's also very naive to simply assume that such a thing could truly be done, much less in a short amount of time, and even if it could be done, it would also be, like most peace achievements, a VERY fragile peace that can easily, and most likely would be, undone BECAUSE of reasons mentioned above with mankind always having differences and such. So, in all, the type of "true peace" trying to be achieved could only really be done IN a fantasy.