Off-topic I guess, but the worst 'aggressive begging' I've ever encountered was last year in Vancouver. We were pursued and abused by beggars constantly in the Canada Place/Gastown area, and they even hung around our hotel entrance on West Georgia. Even Cairo beggars don't behave in such a threatening way.

Why do the City Fathers allow a wonderful part of a lovely city (an area which earns the city a great deal of tourist-money) to be made so threatening and uncomfortable for visitors?