Aristotle wrote that, thousands of years ago. That observation goes back so far there must be truth to it.
People have two contradictory urges: the urge to be free, and the urge to be a slave - the urge to be taken care of. I suspect the reason slaves are no longer used is because of technology. It makes slavery obsolete.
Yet the urge to be a natural slave is still there. What to do with it?
The problem today with the natural slave is that they sink to the bottom and live on welfare. In other words, they do no work at all.
Think of the movie, Idiocracy.
I suppose we could completely cut off welfare and make them work. But that would require a robust economy - no Federal Reserve Bank, no inflation, 90% of regulations gone. There there would be jobs - lots of high-paying jobs.
And they certainly shouldn't be allowed to vote. It's the main reason democracy doesn't work - the smart are always outgunned by the stupid and lazy, and the productive are brought down by the parasites out of sheer envy.
It's more than a little unfortunate that some people can't handle freedom. And we're importing more and more of these people.
In the long-run, we're going to end up with a few nations within the U.S. - one for the smart and productive, and one for the Morlocks.
Neal Stephenson, in one of his novels, The Diamond Age, predicted this. Everyone joins a tribe according to their nature. Some are smart and productive, and some are as lazy and criminal as hell.
Of course, the smart and productive have defenses to keep out the undesirables.
Which, right now, we are lacking. For a little while longer.
"For Aristotle some people were naturally strong but weren't very bright and so weren't very good at organizing things for themselves and would only 'flourish' properly under the direction of another, of a benevolent master, such people are natural slaves." - Theophorus