Can prayer change God's perfect plan?

[MellisaClarke]

I think that's a part of being omnipotent.

I will ask my pastor the question as another person here suggested. Still uncertain about question in first post.

Being omnipotent means He has the power to control everything (within His own nature), but that doesn't mean He does. He chose to give us free will and let us make our own choices. He chose to create a natural world where things happen as they will.  

Yes, ask your pastor.

I don't want to think of it like that.
What if police officers and judges ignored murderous criminals, and allowed things to proceed as they were?

I believe God's plan is far deeper than the scenario you lay out.