Well unfortunately this is just not the case when it comes to air travel. I work for a major british carrier and although we do have a "book" of banned passengers, they still regularly manage to board our flights without being recognised. And not enough airlines share their lists!
As for the justice system in the uk, it seems to me that the hype of 9/11 is well and truly dead as judges dont seem to be strict enough with abusive passengers! A crewmember I flew with recently told me how he had to go to court following a violent assault but a passenger in which the crewmembers nose was broken. The judge in Crawley or Horley, whereever it is,gave the man a £52 fine and had to write an apology to the airline...not even the crew member!!!! Thats Britain for you!!!