Meanings of new barbarians in English

Education secretary Sir Keith Joseph called protesting students "the new barbarians".

But these new barbarians could not be won by arts or the ministers of religion.

But in the beginning, the southernmost patch seemed surely doomed to slavery or worse at the hands of the new barbarians.

Have I not simply been provoked into a reaction by the sight of one of the new barbarians usurping my desk and pawing my papers?

Would the graceful elegancies of life, the high culture of the arts, indeed be safe in the rude and devastating hands of the new barbarians?

Or Enzo Castellari's The New Barbarians, where the American footballer Fred Williamson is a kind of Jedi-ninja in a desert ruled by lawless bikers.