It pretty much is the default assumption, but like most complex phenomena it tends to be multifactorial. I'd recommend the quaternary extinction page on wiki fo

It pretty much is the default assumption, but like most complex phenomena it tends to be multifactorial. I'd recommend the quaternary extinction page on wiki for a broad sketch of general arguments. They basically revolve around the timings (which in many cases pre- or post-date human arrival) and differential impact. [1] https://en.wikipedia.org/wiki/Quaternary_extinction https://en.wikipedia.org/wiki/Quaternary_extinction