Can’t be explained easily. It’s a bunch of variables triggered at opportune moments setting in place a mish-mash of values that somehow manage to work.

Take a day in your life. Think about what was good and bad in it. Then think what it would’ve been like had the good things failed and the bad things succeeded instead. Would that change your perspective on how the day went? As day after day pass, these small, usually things cement themselves into a view on life. Who learns what changes from person to person because what, when and how we learn creates differences in values and personality.

An example, you and your brother argue over a toy as children. If the argument escalates and you hit each other, the winner and the loser of the fight will have different perspectives on the situation. Same if a parent or an adult interferes and casts judgement unilaterally. Each person involved will learn something different from the others and this will shape in which direction their overall personality will view the world.

The good and the bad change depending on the position each person is in and each situation can evolve in many uncontrollable ways.