I was once pulling out a suburban on M-72 when an officer approached. He said that since I was running my headlight strobes, and beacon, I was okay. He even stayed to stop traffic as I pulled.
I think it's up to you to check to see if the law has been broken. IE, if the guy in the ditch is wasted and lost it, then you've helped him get away with a crime. The car could be stolen too, then you're an accomplice, so the risk is all yours.