A recent trend in paleoanthropology is to suggest that the megafauna of Australia was not wiped out by Aborigines; that kind primitives would not waste giant marsupials. My favorite edit job on human expansion is the oft made case for the extinction of Ice Age megafauna in North America at the end of the last glacial period. According to our liberal scientists this was just because the weather changed not from humans showing up and murdering the big beasties. Of course, those huge animals survived previous interglacial periods in North America and in Eurasia. And all of the spear points mixed in with their bones must be pure coincidence.
Check out these guys and consider that most American men run and hide like bloody quivering vagina at the mere mention of a minute of friendly boxing.