I find it HIGHLY irresponsible to kill any native wildlife where it can be avoided, if not for food purposes. ( I make an exception for some bugs... Mosquitos are quite plentiful! but even i dont kill spiders i see.... or even every wasp, or bee)

There is no reason to kill snakes in ones yard, regardless of species. If you find that you have problems with Venomous species, i suggest hiring someone to come and remove the species for you, to relocate them. And checking your yard regularly when your children go out to play, if they are that much of a problem. Also teaching your children where to play, and what to do when they come across a snake in the wild is far more responsible than killing an animal that is, more than obviously quite fit for survival, and is continuing its species.
I think it a great waste when people kill snakes, and other reptiles/animals in their yards, just because they can, for no other purpose than because they dont want it there.

i dont care how plentiful that species is unless it is a nonnative species that is causing destruction of the local habitat. ( Burms/Iguanas/Feral Cats/Feral Dogs)