"How can anyone know these aren't a threat without knowing whose they are?"
Easy. They didn't say they don't know whose they are. They could belong to a private contractor who is paid by the military but the military doesn't own the drones nor company (plausible deniability /outsourcing.) Or they could be a friendly country (e.g. UK) red-teaming the US with our consent.
I've never heard anyone apply the Five Eyes horse trading to inter-country UFO-related dynamics of operation but its fairly conceivable and has a bit of precedent, right?
Easy. They didn't say they don't know whose they are. They could belong to a private contractor who is paid by the military but the military doesn't own the drones nor company (plausible deniability /outsourcing.) Or they could be a friendly country (e.g. UK) red-teaming the US with our consent.
I've never heard anyone apply the Five Eyes horse trading to inter-country UFO-related dynamics of operation but its fairly conceivable and has a bit of precedent, right?