Too many ferals = lots of problems.

Reportedly we have hundreds of thousands of feral camels, and pest shooting is the only way to significantly reduce them.

Big distances. Arid climate. Rough roads, if any where they are shot. Economics means the meat can not be used or used economically, but hey if you're willing to pay 10x the price for a feral steak, go for it!

Similar culls at other times and places have been done on buffalo, horses, donkeys, goats, deer, pigs etc etc. Roos too are culled and left to rot at several million per year as well.