Why did God do Satan’s bidding?

[John V]

The bible does show his giving Satan the power to deceive the whole world. Strange that that power failed with Job. So much for God's power.

Where and, more importantly, when?

You are right that Job came out ok in the end but does that justify God or Satan killing all those others who definitely did not come out ok?

How do you know that those killed did not come out OK? Heaven is definitely OK. How do you know Job's children did not end up there?

You say that God controlled Satan yet this shows the reverse.
"although thou didst move Me against him, to destroy him without cause."

I can try to incite you to do something. It's still your choice to do it. If you do, that doesn't indicate I controlled you.

Do you think it moral to kill or punish someone without cause?

Job did: "The Lord gave, and the Lord has taken away;
Blessed be the name of the Lord.”