Are you saying that this is the actual number, or just using it as a 'for instance'?
Afaik, the top 10% households control something closer to 75% of the wealth, and the top 25% between 85% and 90% of the wealth. If this is true, and I don't know that it is, then the taxes paid by the wealthiest Americans aren't even close to being commensurate with the wealth they control.
I'd guess that between 30% and 35% have no net wealth. Again, the actual percentage might be lower. But it seems to be increasing.
I don't think this a healthy state of affairs for the US. But I could be wrong about that.
We do have to keep in mind that even though a significant portion of the US population controls a rather tiny portion of the total wealth, it's still a fact that the bottom, say, 25% in the US have it better than most of the people in the rest of the world.
But is this how we should be looking at it? Or, can (should) the state of affairs in America be improved?