I will show you why the Kwans have earned what is going to happen to them.
If they wanted an extraordinary black man to be President, they had a perfectly good Christian genius on offer. They passed.
They had a baby doctor and a freeman after the spirit of the founders. They passed.
The truth is, Lot came through looking for ten good men and he couldn't find even ten. They would have the angels come out to them so they could know them.
What they got is what they bought. It's their wages due. Remember that when you see Vault-Co was right about the fate that lay in wait for them.