Earlier quoted context omitted.
How is increasing inequality a net win? The situation you've presented is even somewhat zero-sum, i.e. the first family's gain comes at the expense of the second. That's exactly what we should be trying to prevent .
It's not zero sum. One family makes more than before. The other makes the same as before. Net win. The extra money in the pocket of the first family is not coming out of the pocket of the second. It's coming out of Amazon's pocket. The alternative is that no one gets raises. That's would be loss for a large number of families and no change for others.
It's not strictly zero-sum because the gains and losses may not exactly offset each other, but one agent's gains still come at the expense of another.