As a software developer, I can speak from experience.
That's not at all how it works.
Here's how it really works. You write a program to do something good. Like sort a list of books by alphabetical order for you. You write the code, compile it, and test it. And you discover the code has a bug in it--and that it just overwrote each title in your list with the first entry. Pow, your data just got destroyed. Better hope you made a backup.
You don't plan for the code to screw up.
You meet the girl of your dreams. You date her, fall hopelessly in love, marry her, and take her to bed. She bears you a son. Twenty years later, your son robs a liquor store and shoots the cashier in the head.
You don't plan for your child to be a murdererer. It's something that, once in a while, will happen despite the best efforts of the parents. You did not create the murderer. You only created a child. The child committed the murder all by himself.
God didn't create pain and suffering. We did.
