Cowboys did not exit until the 1870's. It required the railroad to be built first. They did not drive cattle all the way to Chicago and NY before then.

The blood shed against Natives did not begin in earnest until after the Civil War. Experienced killers were abundant.

The war against the buffalo by shooting them from trains was to take the food source away from Indians. Buffalo skulls were piled over 100 feet high.

Any Cowboy that treated Natives as true human beings were good in my book.

There were few of those on TV