Ward is a paleontologist unlike Peiser who is a social anthropologist. If you don't know this makes Ward more qualified to speak about extinction history your grasp of science basics is far worse than I thought. Peiser was grossly exaggerating to state that most extinctions were probably caused by impacts. This point was clearly made in the rebuttals for any but the most obtuse. To Peiser's credit he shut up and did not compound the error after getting dusted by the "hard" scientists. Some here would be wise to follow that strategy.

It is certainly up for debate as to how many of the mass extinctions were caused by impact, but the fossil record is clear that those are not what caused more than a small fraction of extinctions. Ward's point that the K/T impact is the only one with a strong correlation to a mass extinction and that it is conjecture to claim most were is a secondary one in pointing out Peiser's huge error.

There are many more errors of interpretation in your post, but these are the big ones.

Regards,
Mark