God doesn't prevent terrible things because?

[The Fury]

IIIIITHE1IIIII said:

You can't have free will and determinism at the same time. That is basic knowledge.

If God is omniscient then he knew every detail of what would happen on and around Earth before time as we know it started. The way things were, are and will be were completely determined by God, as he made the decision, again, before time started. I.e. had he decided to change some details of his creation we would have made completely different decisions throughout our lives. But he settled with our current situation.

Settled? Is this really the best option for this creation? Because it's a crap one. This is where my idea that Gods knows all possible outcomes of future events and the fact Free Will shapes this.