> Do you keep a 5 gallon jug of spare gas in your garage? 165 kWhr

If you keep a 5 gallon jug in the garage, your risk is higher than if you don't. If you keep a lawnmower in your garage, your risk is higher than if you don't.

Like I said: the higher the amount of potential energy, the greater the risk of it being released in a way that will make you sad. It's a straightforward derivation from thermo.