The urban underclass is like a fleet of cars that breaks down continuously, never gets fixed properly, and is a huge drain on the owner's resources. The mechanics who work on these cars don't want the owner to get new cars (for obvious reasons), and because the government owns the cars there is plenty of political influence to keep the owner from replacing them.
Good analogy, but I'd take it a step further. I would replace "never gets fixed properly" with "purposefully sabotaged".