In an unstable world, where power projection is necessary & inevitable, it is a tactical move to neither confirm or deny existence of unparalleled technological edge. Create an elaborate story around unexplained IR camera observation. Potentially drop breadcrumbs & leave it ambiguous to project existence of superior otherworldly technology.
I believe most of us agree at this point, whatever proof publicly exists isn't incontrovertible - but ambiguous enough to be an umbrella for other top secret projects. Aliens aren't selectively choosing US - if you pause & think. And if that should not happen, evidence of similar standing should pop up elsewhere as well. The fact it isn't seen by India China Turkey Japan or any other sufficiently advanced military, is somehow not matching up with critical reasoning. (And many of these militaries actually do have strong public outreach just like US af-mil)
Leaving aside the military, clear photos have not showed up from the regular citizenry despite us having astrophotography capabilities in phones since sometime. The evidence or lack of it, isn't adding up