The world itself is a system of conflicts. Things take from one another to survive. Things take from their own species to survive, to make sure their lineage continues.
Killing, living, survival, dieing.
The world functions on basic principle that make world peace impossible. Because conflict is something inherent when there are limited resources, space, water, food, energy, and so on and so forth.
Humans are animals, we cannot suddenly say we are going to change the fundamental way the world works, fundamental laws about how life works, just because it is "beautiful".
With world peace all you need is one person who refuses to follow it, then everyone else of completely unprepared and it will result in chaos.
Take and read some actual philosophy before arguing it Lantz.