Both snakes you mentioned are primarily lizard/bird eaters.
I am not going to get into a long drawn out discussion on how all rodent eating snakes are beneficial.{even Crotalus Atrox} I do not even oppose people killing them if they are a nuicance. I think it is in somewhat bad taste to post graphic butchered images but that is just me.
Feral cats pose more health risks to people, pets and especially wildlife, and I do dispatch a good number of them every year, but I do not post pictures of their buckshot/.308/30-30 riddled bodies. It is in bad taste.
Your average mouse has a litter every 21 days of 4-12 offspring. Those offspring will be having their own litters in as little as 60 days.
Do the math.
Every rodent eating snake killed allows millions of disease carrying vermin to be born.