Using a good person's good intentions toward helping the helpless as a pretext to victimize them.
A person with a concealed carry license who is aware of this scenario and still stops to render aid might be looking to engage in a gunfight. Not wise. A better course of action is to drive a safe distance from the ambush sight, call the police, and await their arrival while remaining in one's own vehicle. The 911 dispatcher should be made aware of the possibility of an ambush, and inform the responding officers of that possibility. The Samaritan should remain in the area to give a report to the responding police.