Full moron is more than partial moron.

A partial moron might believe whatever he's told but then have a "wait a minute, something's not right here" moment. A full moron doesn't have that moment and spreads the problem to others.

Another example would be a "leopards are my face" moment. A partial moron would be surprised that approaching a leopard caused them bodily harm but learn not to do it again. A full moron would sue the leopard but do it again with their child.

Another example: a partial moron gets directions, sees the distance, thinks a half tank of gas will get them there and back despite prior trips showing the opposite. But they have a Jerry can in the trunk. A full moron wouldn't have the Jerry can and buys a bigger vehicle with a larger engine because it comes with a bigger gas tank and then blames the liberals when they still run out of gas.

Partial = recoverable, full = hopeless