Do you think that humans will ever be able to live together in harmony?

Hell no
Humans no matter what race they are, are too warlike.
Can't blame turmoil in the world on leaders of NATIONS
What's that old saying?
"Most wars start over the backyard fence."
Humans love to hate and battle each other
As long as they remain this way
Forget about world Peace and harmony.

There’s not even harmony in this cesspool so I’m thinking “no.”

Only when things they are fighting over are in abundance. Water, resources, energy, land. With science and technology it maybe possible one day.

We’re tribal by nature

The problem is people don’t want to see the reality of division and why it exists.

Harmony is escapism.

I have hope that in a few hundred years humans will evolve enough to be able to live together in harmony

I love harmony, it's just not meant to be.

Partially, yeah that is actually the case

One day, after the cleansing.

No.