You take what you see, you build theories, you test them, etc. Sometimes they work, sometimes they don't.

I've noticed that Old People (yes, I'm including you in that) tend to be pretty cynical about paleontology especially, because of how much has change in the last half-century. T-Rexes don't drag their tail anymore, the brontosaurus was just a mismatched skull, apparently some of them had feathers etc.

You realize that the field was more or less revolutionized by advanced technology, same as everything else, right?

Are you also cynical about microchip fabrication, simply because 50 years ago a computer was the size of a Winnebago? All the benefits from technology and computers- advanced scanning, advanced data processing, advanced fabrication, advanced global communications- have boosted the study of dinosaur bones, just like everything else.

Sorry, but it just touches a nerve when people go "Scientists are so dumb, ugh, in 50 years they'll be saying everything they think now is silly." Dude, a human calculated the circumference of the entire WORLD back before Jesus had played his first wedding. We learn things, and we build on them.