Universal peace isn’t a realistic goal, And then what, Will it stay that way? Will we remain happy with this arrangement we managed to agree on? Relative peace with some conflict, On the other hand, Is something we are already working toward. Especially compared to how we used to treat other nations.
However, It may be extremely hard, It's not impossible, If there were just some crazy coincidence where everyone had all of a sudden had the same opinions about everything, & didn't show any hate or violence whatsoever, Then it could work, So, Therefore, It can indeed be proven possible to achieve world peace.