What convinces you that the phenomenon is NHI and not human built craft?

Hi guys, I’ve been following this topic for a few years now but my attention sparked fully a little over a year ago when the objects were shot down over Alaska. I’ll make this brief. It’s obvious that there IS a phenomenon, however as I research more and more I am constantly finding myself teetering between thinking it is the product of human built craft or thinking it could be NHI. I would like to know what people think and what evidence they believe is conclusive for either side. I am aware that there is a possibility that humans have built craft influenced by NHI tech, however what I am looking for is the proof that NHI were an influence in the first place. Thank you!