That's pure FUD, a car could easily cause the same fire, and the average fire in the hills does turn into a firestorm, it requires a particular set of circumstances.

Not FUD at all, "pure" or otherwise. Here's why:

- Cars travel defined roadways having mandated brush clearance zones that diminish the likelihood of a vehicle crash/fire propagating into uncleared country. A fiery crash is very likely to be noticed and reported immediately, with no uncertainty about its location. Fire responders will be quickly dispatched to the correct location. The road on which the crash occurred will very likely give responders good access for their suppression work. If evacuation is needed, it's easier to direct evacuees to routes that will be most effective in getting them out of danger.

- A drone isn't constrained to defined roads. Compared to the car crash scenario, when a drone crashes away from roads and ignites vegetation, more time will pass before the fire is noticed - reported - located - and fire suppression resources put on site. Away from roads, this means airborne fire suppression and that adds at least 30 minutes to the response loop, even when (as now) there are airborne assets on alert. So an off-road ignition is almost guaranteed to have a longer incident response time than a car crash. Same is true of other off-road fire events like careless hiker cigarette toss, camping fires, etc. Directing evacuees which way to go becomes more difficult.

- Favorable firestorm circumstances: even small fires can combine with topography to generate fast up-slope winds that, while local, are very effective in broadcasting burning material that ignites locations remote from the original burn.

Summarizing, if a drone crash starts an initially unobserved fire in an uncertain location that's tough to access, there's a larger chance that it will become a danger to the local rural population than one started by a car crash.

It's FUD because you're citing a worst-case scenario. I'll acknowledge that a drone is more likely to crash in a dangerous fashion (from a fire perspective), but it's still insignificant compared to the real risk that we live with every day from automobiles.