Why do you people put up with those practices?
Depends what you mean by "put up with". Most people look down on binge drinkers and attempts to crack down on it (and other forms of anti-social behavior) are generally very popular. A good trick for an aspiring local politician in somewhere like Leeds or Manchester is to complain about the mess drunken students (from outside the city) make. Worth a few votes every time.
Not that there's a lot that can be done about it with the current licencing system though; most people just avoid areas with a lot of pubs, at closing time.
Police can't arrest every piss artist you know
Current licencing system has been around since WW1 or so. Blame the Liberals
The 11pm limit is going to be scrapped soon anyway; it may be to late to reverse the trend though. Which is why I support giving local government a lot of nice new powers over who can sell alcohol and when.