The more I see this horse tradition over horse culling debate, the more I understand that here in Australia there are still too many people who think themselves as British colonists instead of real Aussies (or at least appear that way), in the sense that they'd rather protect an introduced species over native ones. We all fully accept that foxes, introduced by the British for fox hunting, should be exterminated in Australia. I've never seen people against it. That's an old "tradition" being revoked. And feral horses are the exact same thing, except as they are still being used in cattle stations and such, we can't let them go...
Maybe the "salvation" will come from a stronger group than environmentalists and bushwalkers, which are farmers. Apparently they carry sicknesses that are passed on to cattle and domestic horses (
http://www.environment.gov.au/biodivers ... -horse.pdf ). After all, this is why the camel problem is being taken seriously now : not because of plant damage, the government couldn't care less about that, but because of the damage brought to fences, water tanks, etc... in cattle stations.