Good or bad

How do you determine who is good or bad? If a crook spared your life, was he good or bad? If a doctor maltreated you, was he good or bad?

Do we need to feel guilty to our friends?
If someone goes to buy something, and you feel like getting something too but lazy to go, would you ask them to get it for you? If they do get it for you, do you feel some form of guilt towards them?
Conversely, if you were the friend that went to get things for your friend, would you expect to be appreciated? or in that sense, wish them to feel guilty by? Friendship aside, you might not do it for a stranger, so what rules are there to dictate these expectations and behaviour?

If a friend did things for you out of his way, you might feel he treated you well. But what does that transaction actually involve? What are the unwritten rules, if any in the first place? Conversely, if you did things for your friends, would your expectations be the same? 

The issues might seem to be trival but how or what greater law governs these feelings, behaviours and thoughts? Our experiences guide and shape our perception. But what monitors and defines them? How do we implicitly know things we were never taught, had never experienced or not even conciously aware of? Does religion adequately fills this void? Or is there something more? What is it?

Is this the void in which evil, unhappiness, greed and all other unpleasantries of 'pandora's box' originates from? Is this the source and pool in which they reside in? Must human nature encompass this abyss to be complete? Can we function without this void?

Man... I'm tired...