That's the number to beat, and even a single collision with an airplane would most likely make up the yearly allotment before we even get into "package falls on someone's head", "drone runs out of battery over the freeway", and all the other failure modes a drone has.
On the subject of vehicles-causing-accidents, it's possible delivery trucks trying to beat a deadline may be over-represented in statistics. Speeding, driving aggressively, parking all over the place. So there's that.
Planes fly at much higher altitudes than delivery drones, so the only collision worries would be near airports. The FAA already bans drones near airports and requires special authorization to fly a drone within miles of major airports. Even if you get approval, you can't exceed 400 feet above ground level.
If you're worried about delivery drones flying over neighborhoods, you should be even more worried about multi-ton delivery trucks barreling through places where kids play.
1. https://pix11.com/news/local-news/cyclist-fatally-struck-by-...
2. https://www.lehighvalleylive.com/traffic/2021/12/driver-of-f...
3. https://mynbc15.com/news/local/mobile-ups-driver-indicted-fo...
4. https://www.foxla.com/news/amazon-denying-responsibility-aft...