Why would they need to shoot them down? Porch pirates just take packages that are delivered while nobody's home... that model still works fine with drones, and adding a bunch of gunshots to it doesn't seem like it would improve the chances of success...
Depending on whether a drone is considered a vehicle, that might be classified as a felony. Even people willing to be "porch pirates" and steal delivered packages might not want to commit a crime that could yield serious prison time.
The kinds of places you have rampant porch pirates have a large intersection with the kinds of places the cops will jump at the chance to roll up with five cruisers to harass someone over a negligent discharge.
Regardless, nobody is gonna waste bullets on drones when you can just nab it off the porch after it lands and drops it off.
Kids playing target practice with whatever's available to throw at them seems more likely to me, but my dated perception of childhood still has kids outside terrorizing neighborhoods and generally raising hell.
You can just walk down any suburban street at mid-day and load up your wagon with all kinds of packages. Why draw attention to yourself trying to shoot a drone?
