Princeton has been a hotbed of anti-impactor GIGO. Some may remember the book by Charles Officer and Jake Page (see below) that claimed on the dust jacket that the sudden extinction by a large impact was "impossible". Dewey McLean used to run a website on which he claimed that the elder Alvarez basically ran him out of his own profession through threats.
And, let's not forget Aristotle, the Father of Nothing Doin', who stated
ex cathedra that stones do not fall out of the sky. Even in 1994, with comet SL-9 about to crash piece by piece into Jupiter, the cover of
Astronomy featured the title of an article inside that claimed there would be nothing to see from those impacts.
I was one of the lucky ones. I picked up this title off the remainder rack, cheaply, at the enormous chain bookstore.
Basically, I hold such claims in contempt. Such folks are stuck claiming that it was just an amazing coincidence that a large impact happened right at that time, or, even worse, that all the impact did was set off worldwide volcanic eruptions, and those led, over 100s of 1000s of years, to the extinctions.
Even in 1994, with comet SL-9 about to crash piece by piece into Jupiter, the cover of Astronomy featured the title of an article inside that claimed there would be nothing to see from those impacts. Fair and balanced? I'm no rocket scientist, but something tells me when a chunk of rock or ice or, say, Rosie O'Donnell hits the planet at mach 20+, $hit will happen. Most of it bad.
FGS