Well now we're just debating semantics. Your prior statement was "since modern day humans climbed down out of the trees and began hunting and gathering."

This implies you are referring to either Homo erectus from 1-2 million years ago or even earlier ancestors such as Homo habilis, one of the earliest hominins, which dates back near to 3 million y.a. In truth the entire sentence conflicts itself because modern day humans did not "climb down from trees" as you imply.

I do agree with you, however, that as soon as our ancestors could walk, they started to run from large predators.