It's not a bluff. Trust me, if there was scientific evidence of ET intelligent life visiting us, it would be all over the news.
More than zero reliable witnesses for the existence of extraterrestrial intelligent life visiting us would be a good starting point. Vetoed by the scientific community, not associated to UFOlogist conspiracy groups, who understand the scientific method and who understand unexplained phenomena is just that: unexplained, and who are not trying to sell a book or a story for a made-for-TV movie.
Example template of unreliable and unscientific witnesses: experimental jet pilot who claims to have seen/recorded footage of a strange flying object that, according to his proven experience, cannot be flying according to known physics, and he has never seen anything like this. Also, one of his friends is an astronomer and told him what he saw is likely ET life. Also, his commanding officers told him to drop the issue. Someone made a documentary out of this and it's now on Netflix.
Why this isn't good evidence by a solid witness:
- Experienced pilots are not scientists nor physicists nor biologists. They are in no position to judge what is or is not possible, or what is a hint of ET life.
- Experienced pilots also lie and exaggerate.
- Unexplained phenomena is just that: unexplained. It can be equipment malfunction OR a genuine interesting physics phenomenon that is not easily explained... yet. An interesting puzzle, sure. Evidence of ET life? Very unlikely.
- Commanding officers dismissing him may be due to this being classified intel, them being annoyed at the UFO weirdo, or simply not having the time for that nonsense. The least likely explanation is that they are suppressing evidence of ET visitations.
- Random astronomer/scientist friends are not evidence when they assert things in isolation. _Doubly_ so if it's outside their area of expertise.
- Vetoing by the wider scientific community is necessary.
- Documentaries on Netflix or articles on magazines or websites are not evidence.
- Occam's Razor must be wielded before deciding this was indeed a UFO piloted by extraterrestrial beings instead of simply a natural occurrence on Earth.
Your turn.