spat
.700 Nitro Express
The logic goes back to an era where a cow kicked over a lantern in an unoccupied barn and it burned down half of Chicago.If I recall it doesn't have to even be occupied.
It can be an abandoned shed.
The logic is the firefighters rushing to put the fire out are at risk of a crash and injury and injuring the public,. The firefighters can still get hurt or killed fighting a fire. The fire can spread to other occupied structures.
It's essentially open season on Arsonists because their actions create secondary effects which put others lives in imminent danger even if the building they light on fire is vacant.
It's not about "occupied" it's about arson having a tendency to spread far beyond the initial structure in an urban environment.
Even in a rural area, someone setting fire to a garden shed full of flammable materials can start a forest fire that causes massive destruction.
That's why historically arson was considered more severe than even murder.
You murder someone, it's unlikely to destroy a city.