I know a surgeon who spent some time working in the ER. She would help all sorts of patients, including many homeless people. She said it was not uncommon to be

I know a surgeon who spent some time working in the ER. She would help all sorts of patients, including many homeless people. She said it was not uncommon to be punched or hit by people they were trying to help, especially those under some any form of influence. Also, there is a known psychological effect of having many people around a victim that all expect others to do something. It becomes easier for people to ignore victims to the point where I've heard of people in very traumatic situations being completely neglected because there is just such a mass of people in the vicinity that no one helps. People should all help each other out, but there are both good and bad reasons that explain why people don't always jump in to help.