Well that's a nice professional attitude! What do you think will happen if he:
- Over-pressurizes the fuel tanks
- De-fuels instread of refuels
- Loads contaminated fuel.
- Drives the truck into the aircraft. (or allows it to roll)
- Drives off without disconnecting the fuel hose (if it ever gets connected)
- Has a smoke during refueling
- Loads 5000kg instead of 500kg
- Etc, etc
That could make a funny story for you! I'm sure most of us do know how to earth an aircraft.