How does we feel,when we are in a crime scene,and how does we feel when we see that crime?

What kind of feelings we have,when we are in a crime scene,when we see it,when we live it?

Normally it can be a mental shock to a person to see or be at a crime scene. many feelings can be felt at one. I have seen some and they can make you want to cry or to get revenge. it really just depends on the person.