> more often than they have prevented your house from being broken into
The whole point is that you can't tell whether that's happened with the data presented, regardless of what you compare it to, and no, once is not too many times given the actual thing we're discussing.
If the existence of Air Marshals prevented one more 9/11 type event from happening, or even a few failed attempts (which would be capitalized on by politicians to push their own agendas), then I would without reservation say they are worth it. We just haven't been presented with that data. In some cases it may not exist. Acting like the answer to that is irrelevant is not the correct way to go about it though, in my opinion.
The whole point is that you can't tell whether that's happened with the data presented, regardless of what you compare it to, and no, once is not too many times given the actual thing we're discussing.
If the existence of Air Marshals prevented one more 9/11 type event from happening, or even a few failed attempts (which would be capitalized on by politicians to push their own agendas), then I would without reservation say they are worth it. We just haven't been presented with that data. In some cases it may not exist. Acting like the answer to that is irrelevant is not the correct way to go about it though, in my opinion.