Back when Luis and Walter Alvarez came up with their hypothesis that the impact of a large asteroid ( or comet) caused the Cretaceous extinction, most paleontologists didn’t like the idea – disliked the very taste of the idea, regardless of evidence. They had been taught that the key processes of evolution and geology were gradual – not just that the same natural laws applied in the past as we see in the present (true as far as we can tell) , but that the predominant processes shaping the world and its life were (always !) generally similar to those we see today. In large part, this was was motivated by opposition to Biblical accounts of the Flood, etc. Catastrophism ( of any flavor) was just wrong.
You could call them ‘base-raters’.
So there were reasons, what you might call philosophical and historical reasons, for their dogged opposition to this new and highly catastrophic theory. And have reading a number of books by prominent exponents of the position, people like Charles Officer, Jake Page, Dewey McLean and Gerta Keller, there was another factor:
They were quite stupid.