Noun
village idiot (plural village idiots)
A person widely known in their community for their stupidity and ignorant behaviour.
You're an idealist, and I pity you as I would the village idiot. Stanley Kubrick
Mechanical instruments, potentially a vehicle of rational human purposes, are scarcely a blessing when they enable the gossip of the village idiot and the deeds of the thug to be broadcast to a million people each day. Lewis Mumford
The new heroism - put a village idiot into a pressure cooker, seal it up tight, and shoot him at the moon. Kurt Vonnegut