Re: Is it grammatically correct to write: I had a thief steal my car
The original does soun like it was arranged. "He had a thief steal his car" certainly sounds like the makings of an insurance scam to me.
But "He had his car stolen by a thief" sounds like this unfortunate thing happened to him.
So "He had his head kicked in by a couple thugs" is different than "He had a couple thugs kick his head in." (First: How sad for him. Second: Does he have a death wish?)
I'm at a loss to explain the missionaries though. That makes sense as-is. Maybe it's the "just."
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.