I also believe that the US do not have Good Samaritan laws so if some shyster decides to sue you for helping in the case of an accident or emergency., especially if you are a medical professional you see screwed. Might explain a lot. As for the rest depends where you hang out. I see callous individuals every day in public and also some real treasures who will chat and dine of themselves. A lot of people are tired and under resourced. Your bucket needs to be partially full before you can give to others and most of us have experienced this. Naive generalisations