The UK Bobbies (Metro Police) are known for their patience in dealing with people including the troublesome ones. They had a very hard time with rowdy rioters & scums in London & a few other UK cities recently. It's not only during the Notting Hill Carnival that these Bobbies project themselves as friendly, & nice. They can be very firm with the law breakers/rogues & that's good for law and order. Sometimes they have been unfair press reports/criticisms about them. You have to be in London & the UK to experience their sense of fairness & duty. One can observe/read what has happened in some other cities in other countries (you would know about them) - the police are waiting to clobber dissenters, peaceful protesters with a very heavy hand.