Whats to stop me from going down to the local gas station, filling up a few thousand liters of gas in a rented moving truck, and driving into my nearest hospital?
Most people aren't terrorists. You can't just argue stuff is dangerous because it can be one piece of a sophisticated plot.
In China, you can't get that much fuel in local gas station to fill up a truck. That is just one of many things you can't do in China. In the name of safety. Keep asking that question will probally end up with fewer and fewer things we can do.
Nobody will sell you a few thousand litres of gasoline at a gas station.