How nice are you?
Many people are nice people. They can help and save people, or simply just be thanking and asking them to "please pass the salt." Either way, you're a nice person.
It takes a bit to be nice. You can't judge people before meeting them. You can't push people around. You need to remember that some people are in worse situations than you. Now, being TOO nice can kill you. But being not nice enough can kill you easier.