DD's friend (4 years old) with sensory issues skinned his knee at our house. He literally sobbed for 2 straight hours. There was nothing that could comfort him (and he had 4 adults trying). I'm sure the neighbors thought "someone should pick that child up!" or "what's wrong with those parents! Why don't they DO SOMETHING!!!"
Who knows what the child's history is, and whether the parents were handling it to the best of their abilities or were neglectful. I only know that I, as a stranger, have way less information than they do, and compassion for the whole family is rarely the wrong response.