As disgusting as this behaviour is, it is not just bad parenting or lack of respect that has created these people, the political direction of the country has contributed to it.
As with most things, there's multiple factors that combine to create any issue and the creation of an uneducated, almost feral underclass has been ongoing for years due to political decisions.
Short of locking them away for the rest of their days, there's little punishment that will affect them and therefore you have to try and find ways to change their behaviour and prevent future generations turning out the same way.
Maybe a people's army where they are subject to military discipline, but taught trades and skills instead of how to fight might be an idea on how to rehabilitate them.