Well, mule deer are extremely sensitive to habitat disturbances and seemingly lack the ability to quickly adapt. This allows elk and whitetail to move in and thrive, further limiting mule deer habitat.I lived in NM for 11yrs and still hunt out there. I've heard every excuse in the book for getting rid of whitetails. Western hunters hate them. Never did understand it. IMO it's a cultural sentiment qualified with nonsense excuses.
It's also widely accepted, whether true or not, that whitetail help spread diseases more quickly to mule deer. Apparently they carry CWD at higher rates and do better at dealing with the disease vs mule deer.
Idk, but I'll tell you this; Whitetail are thriving in many western landscapes (mainly river bottom corridors) and private landowners have learned to capitalize on them.