it depends on the cause. I had street people so I don't help them and I think people should not give anything to beggers and bums on the street. They are nothing but scammers hustling people for money so they can buy their next pint or more drugs.
you can read more about this filthy, dirty, waste of human life at street-people.com
-------
bums, hobos, and panhandlers -
true stories from the street on www.street-people.com