In both places, the underclass trades support for continued benefits, and the Left has continually increased the size of the underclass until it is dominant.
The ugly part comes when the free stuff runs out.
At that point, you have an underclass which cannot be supported by the producers any more, and who will fight to continue to be supported. At that point, the only way out for the productive class is the extermination of the underclass.
When The Music Stops: How America’s Cities May Explode In Violence
Or the Zimbabwean approach, which is the extermination of the productive class.