The idea that the scientists (of all people) are dogmatic and unable to change their views undermines everything else you say.
Oh, there are plenty of *bad* scientists - or, worse, *bought* scientists - throughout history, who were or are like that!
Thankfully there's the also the good ones, who do indeed get that it's the job of science to accept new discoveries.
It's just that neither type of them really have anything to do with ancient aliens, since they never existed. Or if they did exist, they sensibly kept out of the way and didn't interfere...