I gotta ask: What exactly have you been looking at that shows that the scientists are making statements that the existence of aliens is “scientifically” proven? Have you ever read any actual research reports that have been reviewed/approved by scientific organizations stating that the existence of alien life has been scientifically proven? What about thesis/disrotation papers that have been approved by accredited universities?
The job of a scientist is not to make headlines, film documentaries, or magazine articles, their job is to do research and make reports on the information they’ve gathered using the scientific thought process. When they’re done creating their reports they have to submit their reports to various scientific organizations, they have to be reviewed, approved, and endorsed by countless other scientists–Only then does their opinion ever count as “professional” and their arguments become “scientifically proven”. Anything they do outside of that is what they do in their spare time.
Yes, even the scientific community has a bureaucracy of its own–That’s what prevents creationism from being written as a scientific law in our textbooks.
Newton was a Christian (hell, he was pretty big into religion), and Einstein was Jewish. There are many scientists out there that believe in a god or some other type of deity, as well as the existence of alien life. But do you know why none of them have been discounted by the scientfic community for their unscientific beliefs? None of them have injected outrageous statements like “God exists” or “aliens exist” in their work-related peer-reviewed research reports. The scientific community knows that scientists aren’t scientists 24/7–They don’t care about what they write in their personal diaries, their autobiographies, or what they say on the news, because they know it’s the scientists’ personal opinion, and they aren’t on the job when they’re making such statements. The scientific community only cares about what scientists write when they’re on the job, namely when they’re writing on their soon-to-be-reviewed research reports. If Newton or Einstein made statements that god exists in their research papers without successfully proving it in front of their peers and scientific organizations, they’d be thrown out of the scientific community. Even SETI itself has failed to create anything that’s been officially approved by the scientific community.
So far, all you’ve looked at are self-endorsed statements on news reports, self-written autobiographies, and self-funded documentaries. Note the emphasis on the word “self”. That stuff you checked contains no endorsement or approval by any scientific organization. All that stuff you looked at are still in the realm of the scientists’ personal opinions, rather than their professional opinions, because the individual scientists you’ve scrutinized have all made those statements/documentaries/biographies on their own free time, and show no evidence of approval or endorsement by any scientific organization. Stephen Hawking himself has already been falling out of favor with the scientific community in the past ten years or so–You really think he can just go out on his own making a statement on some news/magazine site and have his opinion be considered “scientific” without official approval/endorsement by any scientific organization?