I think when Magpie said no one had suggested culling horses, he was meaning that I had not said it as a serious suggestion. Clearly they aren't going to cull their horses, the point I was making, as was obviously clear enough to some, was that we can't always just have our own way with the world and modify it completely. Magpie's comment along the lines of "my friend was killed by a car, how can we stop cars from driving on the roads?" illustrates the point well.
Surprising that someone talks about culling snakes and then you get upset at the prospect of getting rid of horses (which incidentally cause great damage to Australian soils, which didn't "evolve" with hard hooved animals as was the case in most of the rest of the world, not to mention the land which needs to be cleared to keep them on, but that's another story). As pointed out, killing a few snakes will just cause more to move in. Unless you erradicate the local population, you're not going to achieve anything. It's very strange for so many horses to be dying from snake bites. I don't have a lot of experience with horses, but I do know of a lot of horses living in areas with large snake populations and haven't heard of problems, I'd actually question whether or not these deaths are really being caused by snakes.