An origin that doesn't really explain anything. "People do bad things because they're bad." But people aren't bad. People are mostly good. I mean, look around you. At your friends and family and the people you love. Are those all bad people? Are they all evil in their hearts?
What do you mean by a good person or a bad person. Would you draw a contrast between the two in your perception. I know how I want to answer the question but first I want to know how you catagorize a person in to which column.
I believe that people are mostly law abiding but who deffinitly need the laws. I love my friends and family despite their badness. God says that he loves man despite man's badness. How hard would it be for you to love a child who is 90% good? Not hard at all. But take an average child who is 90% bad and try to love them. You still do because love transends the behavioral tendencies.
So loneliness is not a condiction contingent on other people's behavior or even your own perception of other people's behavioral tendency. It doesn't mean that bad people cannot do good. It means that the sin nature of man is dominant and guides the behavior to be bad.
If people were mostly good, things like prisons, criminal law, court rooms and lawyers would be rare. Locks, car alarms, home security systems, armies, personal firearms, servalience cameras and the like would have a very limited market share instead of being common place items in our society.