I’ve added some pictures of what can happen to a vehicle if you leave chargers plugged into the outlets. Actually for years I’ve unplugged electric items at home that I know aren’t going to be used for a while for the same reason, or while on vacation.
In most cases, if there’s a short circuit, just like in your home, a circuit breaker will trip to avoid a fire or shock to a person (shock regarding your home 110 volt circuits, not your vehicle) What can happen, however, in your vehicle or your home, is what happened to the vehicle in the pictures. The charger itself got hot enough to melt and start a fire, but it wasn’t drawing enough power to trip the circuit breaker. The fact that the vehicle was in the home’s garage could have even created more of a disaster.
At the dealership, over the years, we’ve encountered a few situations also where those chargers actually drew enough power to discharge the vehicle battery over a few days. That’s always inconvenient, to have your vehicle not start after sitting at the airport for a week!