Ok...so, let' assume that instead of having to wait for an FAA response as to whom the registrant is (with the FAA that could take a while, and it might be a bomb, so maybe we should just use the dog), there is instead a data base that the first respondents can query, but they can't get a hold of the registrant because they are at the movies, and; ironically, their phone is in airplane mode, or said registrant states they sold it on craigslist, but they couldn't get the label off before the sale, the first responders are back at square one. Or, let's say they do get a hold of the bomber who was law abiding enough to register their flying bomb, do you trust the response one way or another?
It's seems improbable that a bomb of any consequence could be installed within the battery compartment unless the battery itself is the bomb and that the drone bomb was hand placed at the location, i.e. the drone was not flown, but hand placed. In that case, why use a drone? Is plastic shrapnel more damaging than metal? Or, does the bomber hate drones too, and using a drone that can't fly is a way to blame drone pilots, and get on the news? Two birds with one drone...no pun intended.
It seems to me, that if someone was to use a drone for a bomb, they wouldn't hand place it, they would fly it. What is the load carrying capability of a consumer drone? Is it sufficient to carry a bomb of any consequence? Remember, this is in the case it's in the battery compartment, so it can't be a consumer drone capable of flying. DJI is too tight for that.
All of this assumes the external registration number is located in a place that is easily visible. A response in the original thread stated that DJI recommends the registration be place behind the gimbal. How are first responders going to be able to see that without risk? Even if it the registration were placed more visibly, but it's on the other side of the drone. Are you going to surround the drone with binoculars?
If this is their reasoning, it doesn't seem well thought through.
If I can smell ******** from a mile a way, then first responders should be able to detect a bomb by other means than an external registration number.
However, there may be a bright side. Let's say the drone is harmless, but it crashed high up a tree somewhere beyond the VLOS. The pilot could just wait for first responders to call to clarify whether or not it's a bomb. Since they're already there, the first responders can help get it out of the tree.
If that's the case, are we obligated to make a donation?