Ehhh, I don't think it's that simple. But conflict certainly plays a role.
It's very simple. Do you really believe you could live your life where everything is perfect and everyone is happy? You never feel sadness, frustration, no need to think, argue or debate, worry, create, work for your meal or your goals? It'd be boring as hell dude lols, at least for me. It doesn't really take any great philosophy courses or other studies to figure out. It's really a very basic thing you can learn through every day life. Shall I give you a few examples from literature and media?
In the matrix, which from what I've heard Kishimoto based IT on, Smith stated the first Matrix was supposed to be a perfect world. A harmony with happily ever afters forever and where everyone would be happy, but it turned into a disaster because our individuality and instincts could not be caged or suppressed and it drove everyone crazy. The killed themselves and each other, if the rejection of the programming didn't kill them first. Due to this, the architect redesigned it in the image of the reality of the twentieth century. As such, everything went smoothly and very few to none resisted the program. Only the "ones" like Neo could because they could sense the programming and realize it was fake.
Another example would be a Ray Bradbury short story (I can't remember the name) where the world is ruled by one government and everything is at peace, everyone is perfect with no conflicts, worries, goals, etc. They all look the same, dress the same, act the same, smile the same, do the same activities, have the same pastimes and hobbies, etc. Dolls, drones or robots basically. However, one very intelligent man becomes fed up with it and decides to go on a rampage, breaking many small rules and laws, crashing a party and stealing a book, which is forbidden in society, finding a gun, not to steal money or jewels with, but simply to scare people and see their expressions and emotions because he's so sick of their creepy, happy little doll faces and nothing ever changing. In the end however, he is shot and killed, thus his ideals and individuality disappear, thus everything goes back to "normal."