I don't know why you think the fermi paradox is somehow a good argument when I don't even deny the possibility of alien life. Please stay on topic and don't accuse my of something I haven't said, thanks.
Your other point is nothing but a bunch of could've would've. Just like the hearing and the previous statements, which were basically the same.

Yes, sometimes credible people turn out to be totally wrong. Does that mean we should not investigate and either vet or debunk their claims, should we not listen to credible people because they sometimes go nuts or are totally incorrect?

Again, you continue to derail and bring up straw man arguments that I haven't even said. Also, the burden of proof is still on him, especially when "we" cannot prove or let alone disprove any of his claims. That's why I consider this to be a nothingburger until there's actually some proper evidence of anything claimed.

Yeadon sounds a lot like Dr. Wakefield, the other totally wrong discredited medical person who they love to cite because he justifies their irrationality.

There have been plenty of people like Yeadon, in and outside of the medical field. It's just one example that I was able to think of right now because of how recent it was and how much of it made the rounds at the time too. There's people sitting in governments who did and continue to do the same thing, for whatever their reason may be.