That's the advantage of the scientific method -- instead of relying on fixed ideas, new knowledge becomes available. People who don't like information to change see that as some kind of weakness, and are dead wrong.
Sorry, but I think you have a misguided idea about what the scientific method is.
In practice one is supposed to make a theory, test it, and hopefully prove it. Instead we have people making theories and then passing the claim off as true without any proof. A mandible and teeth are not sufficient proof, and yet a few bones make up so many of our claimed species.
They can theorize what the animal may have looked like, how it may have acted, and what it may have been related to - but that is all guessing, no proof, no verifying, no testing.