Interesting observations but you forgot to address my first point which was actually the main point. The evidence of catastrophe near the end of the last glaciation is global but studiously ignored/suppressed by the scientific community. I daresay you won’t find much in “prestigious” scientific journals. Why is that?
Then why was much of the mega-fauna extinction limited to the Americas?
Here's a classic example of the conflicted PC-person.
http://australianmuseum.net.au/Megafauna-extinction-theories-patterns-of-extinction
Here, the claim is made, "Worldwide, there is no evidence of Indigenous hunter-gatherers systematically hunting nor over-killing megafauna."
This is in blatant conflict with exactly that happening in NZ and Madagascar.
What is your explanation for this suppression?