A tribe of people depending on road kill aren’t going to eat meat more than a dozen times in their lives.
There are lots of modern scavengers which prove the falsity of your assertion. Think hyenas, buzzards, and vultures. Condors are going extinct not because of the National Rifle Association, but because they evolved to eat the carcasses of dead mammoths. When the mammoths all died off, the condors days were numbered. Primitive tribes can easily find dead animals by simply noting gatherings of scavenger birds. A man can easily chase off the birds and keep the remainder of the carcass.