I've donated to children in overseas 3rd world countries before, and will likely do so again. The difference from my point of view is the availability of opportunity. In the states those parents living under the bridge need only walk to the nearest Family Services building, and now the child has food, clothes, education, and shelter under foster or state care. In the meantime the parent can find employment, steady-housing, and hopefully within a reasonable amount of time, prove their ability to take care of their child and get them back.
In 3rd world countries there are much, much fewer options if any, and many of the options include much more horrifying circumstances than just starvation.
Not sure what that has to do with South Park being censored in regards to offending Islam though.