This is legal I assure you. You can ignore all claims of population control, venom and everything else and there is still a legal market for snake hides. That in my book makes it hunting. I don't understand the hatred for snake hunters. It stems from protest of the roundups, where protestors feel all captured diamondbacks of the western variety. Whopping the heads off cleanly and skinning is the main complaint.
The species is listed as stable, despite the eradication efforts.
I feel that many landowners will have them killed anyways, so why not let them at least go to market?