Help me understand that - leaving your car plugged in while shopping is no different than leaving your gas car not-plugged-in while shopping, in terms of leavin

Help me understand that - leaving your car plugged in while shopping is no different than leaving your gas car not-plugged-in while shopping, in terms of leaving your property around. The cord is part of the fixed charged, and not my problem ... just like the hose on a gas pump.