I struggle with UFOs that are reportedly caught on radar as evidence for the ETH (extraterrestrial hypothesis). We have had radar-evading Stealth technology for decades now, so it is really feasible that an advanced species of alien visitors would neglect to camouflage their craft against what is a now rather dated 20th Century technology...?
True enough. But I often like to wonder about how different ET science, tech, society, world view etc might be to ours. Just because our species has evolved to view the reality we live in in a certain way, all sorts of things that we take for granted as 'just how it is' might never have occurred to ETs. Such as : love, money, war, entertainment, fear, empathy, etc etc. The list goes on. And in that list could be caution, as in not wanting to be seen by humans. Obviously, the way most UFOs/UAPs are reported to act appears to us as if they are being cautious about not wanting to be seen, but that could just be the way we interpret that behaviour.
As an example of what I sometime wonder about, imagine an ET craft observing Adele at Glastonbury (well, we know they like to hang out around there!). "There appears to be one being standing on a platform making shrieking noises through a big hole in its face. And thousands more of the beings are standing around observing it. They seem to be expressing pleasure. And now the shrieking has stopped. The being is quiet but all the other beings are doing this strange thing with their upper limbs and producing all sorts of horrible noises through the holes in their faces. I have got no idea what all that is about".