Can you imagine what would happen if we had world Peace?

That's a fair point, but one could assume that at least an equal amount of jobs would be created from the sudden need for translators, diplomats, andything relating to working together with countries.

The military gear could be repurposed a lot of it, for civilian use. The loss of money would seem to outweigh the massive potential of a united world.

I'm sure those jobless soldiers could find other jobs to do.

It's not possible under human-only conditions.

And that's why there will never be world peace

The military gear would be sold off.
Nice, peaceful, loving groups like antifa would buy it and use it on anyone who disagrees with them.

It wouldn't matter, because there would be no one left to enjoy the peace.

Precisely. And those poor people will riot. Hence leading to no peace.