Unfortunately, some of these children have become overly pushy. But having said that, these children are actually selling something & learning a skill rather than outright begging. Personally, I would rather see them in school!

There's many different forms of begging in all age groups...from the "woe is me" stories to the aggressive down right "give me a dollar" type begging...it's always better to give a hand up rather than a hand out.
And, by a hand up I mean teaching someone how to obtain what they need/want is better than giving someone a straight hand out.

"Give a man a fish and you feed him for a day; teach a man to fish and you feed him for a lifetime."