What might be some more positive ways to promote giving to charities while educating the public about the breadth and diversity of homelessness?

It has come to my attention that some organizations in America are funding ad campaigns like the one shown above encouraging people to donate to charities rather than panhandlers, for fear that the individuals may use the money to support abusive habits. Such campaigns are a double-edged sword. Although it is true that there is a huge deficit in funding for homeless shelters and other programs, ad campaigns like these encourage homeless stereotyping among an already undereducated public. In short, the images only promote the beliefs that all homeless people are sub-human revelers in substance.