Re: Occams razor
"Drones present about as much risk to air traffic as birds"
I'm sorry, but I've got to ask for a citation for that claim.
So far as I am aware, this has not been proven and risk is a dependent on multiple variables. There *may* be a lower probability of impact, depending on your view of the likelyhood of someone carelessly or deliberately flying into the flight path of a plane on take off or final approach, but the higher density of a drone compared to a bird of similar mass is likely to result in a greater degree of damage at a given closing velocity. However, it must be said that this has not yet been conclusively proven, and research into this is ongoing.
Either way, I wouldn't want to be on an aircraft subject to a bird strike or a drone impact.