It all comes down to us and them.
If they're not us then they're them.
We can't control them.
What we can't control we must fear.
What we fear we must destroy.
The only way to prevent this is to make them us.
When us is everyone no matter who they are, where they live, who they worship, then there will be no need to fear, no need to destroy.

We are willing to do this, but they are not.
So they must be destroyed so we can live in peace.