The bad good vs. the good good

What merits a person to deem one thing bad when the person has never grown up to see bad all their life? That statement is a contradiction in itself. In the plane of existence, good and bad don't exist. It's polarizing, created by humans with our idealistic notions and our needs to hold on to something we call faith. Faith created good, and faith also created bad. Back to the real world, I always had the argument with myself about the good good and the bad good. You see, the bad good is the good that emerged out of bad. The good good is the one that has never seen bad. Okay, so far, this is all gobbledygook. Let's take an example. What I meant is, take a person who has ventured to be what our society deemed bad, taking drugs, running away, petty theft, and doing countless other 'bad' things you can think of. Later in life, this person changed. Something snapped, and then they turn to be good. Now that they are good, they are more in tune with the bad deeds in their past. They realized how dangerous it was, how hurtful their conducts were. They strive harder to be good, they strive harder for their children to not to grow up being their replicas. On the other side, there's another person who was raised in a good environment all their life, had great education, worked a decent job, provided for their children well. This person has not so much seen real violence as only in televisions, has not smoked once in their life, has not ventured anywhere past the shady dark alleyway at night. Is this a dangerous to live life too? Unequipped with knowledge and workings of the 'other' side of the world, the person would never be prepared to deal with it. It's not all black and white, of course. What would be the middle way, I ask?