If you take justice into your own hands against these yobs there are plenty of examples that you will be the ones arrested & our so-called 'judges' (who have appallingly bad powers of judgment) will sentence you for your just & rightful actions. Anyone who disagrees with how private citizens ought to deal with yobs has the society they deserve.
See this link for yet another feeble MP initiative from the new Home Secretary (just how many failed attempts have governments been allowed since Willie Whitelaw's 'boot-camps' in 1979 - you would think they could get it right after decades and decades of trying - do they really know better than us how to improve things?):
http://www.homeoffice.gov.uk/anti-social-behav iour/
(and articles in today's papers on the subject).