Every comet we have visited HAS NO WATER. They are essentially identical to every other asteroid, dry and essentally a rock. The cometary appearance is an electrical phenomenum, not an outgassing of water vapor from ice. That alone falsifies this flawed premise.
Are you familiar with Van Flandern’s ‘exploding planet’ hypothesis? He posited that a watery world larger than Earthc existed approximately where MArs now orbits, and Mars was then a moon of that planet, which exploded and caused the very strange surface pattern on Mars and essentially blew away an atmosphere there, while ‘seeding the solar system with lots of water blobs which have since impacted other planets like Earth. Some of the extinction boundaries may in fact be when large amounts of this ‘blob water entered Earth’s atmosphere and caused massive cloud cover which lasted perhaps a century or more at the time. It is an intriguing hypothesis and he did a huge amount of astro-physical data collection and correlation for his hypothesis. Wal Thornhill’s Electric Universe combined with Hoagland’s hyper-dimensional physics notions (the ones not simply so idiotic as to be dismissed) almost works to fill in the gaps.
Thanks Swordmaker. And BTW, FR is close to unusable today.