What really makes someone a "nice guy," and how can you tell when someone genuinely wants to help?

Do you think being a "nice guy" is more about big gestures or small, everyday actions? Why?
Are there common characteristics among people who tend to have more paranormal experiences, such as working night shifts or being in high-stress jobs?
Why does blaming someone for a crime feel justified, but blaming ourselves feels so much harder?
Is there a clear line between a partner having a bad day and someone intentionally trying to make you feel small?