You really believe James Earl Ray was on a mission from God? Seriously?
In the same way that Satan is on “missions from God.”
That’s an interesting objection, though. It’s the kind of objection that comes from people without a robust faith in the Lord.
The Lord allows for evil agents to do evil things and STILL for goodness to prevail in the end. We look at individual events in a vacuum and want to proclaim a moral judgment on the whole. That’s foolish; only God has a grasp of the whole. Fortunately for us, we also were sent Christ (and the bible, which tells us much useful detail about Him) to save all the willing, so we can have a glimpse of God’s vision too.