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.
Nobody will sell you a few thousand litres of gasoline at a gas station.
You don't have to buy it all at once all in one place.
A sophisticated actor can accomplish a lot. You can't bubble wrap the whole world.
The real thing to care about are the incentives and having strong morals and norms. Something that makes me deeply concerned about the US going full mask off recently.
I think the attempt of people to "bubble wrap" the whole world actually makes things worse. Treat people as untrustworthy criminals by default, and guess what you get by default?
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.