It's a debated issue among paleontologists, IIRC. Surely, human hunting did not help those species anyway. We also know for sure that in more recent times hum

It's a debated issue among paleontologists, IIRC. Surely, human hunting did not help those species anyway. We also know for sure that in more recent times humans hunted many species of large animals to extinction (like giant birds), so until a definitive evidence is provided, to me the hunting hypothesis gets a high prior probability. It also seems that most mass extinctions were not due to a single factor anyway, but to a combination of factors. So, yeah.