I can understand being annoyed by logical fallacies in the arguments being made, although I wouldn't point to a Wikipedia article for a good example of it in ge

I can understand being annoyed by logical fallacies in the arguments being made, although I wouldn't point to a Wikipedia article for a good example of it in general. The K3 argument doesn't depend on directionality. If you use a lot of the energy in an entire galaxy for something you will alter the energy signature in all directions. You would expect more waste heat, and a dimming of the overall energy output. This is just basic physics. It's similar to detection of Dyson spheres or other mega engineering structures. You can argue that they know physics we don't of course. It's certainly true that absence of evidence is not evidence of absence.