I have always said that I am not a security force, a policeman or anyones bodyguard. I will not chase purse snatchers, investigate odd happenings in dark alleys or stand between two fighting men.
Its pretty easy for me to know who the badguy is and who the goodguy is when I am the one being attacked. It is not so easy to understand what is happening when others are fighting.
If I felt like a innocent persons life would be forfit right here and right this second if I fail to act... I would act. That is a whole lot of certaintly that would likely be lacking in a situation that does not directly involve me.
Would I step out in front of a bus to save a small child chasing a ball? Yes
Would I chase a man with a gun who is running away from me? No
Life is a web woven by necessity and chance...