That's the problem, a lot of invasive pests have been brought in deliberately to 'solve' another problem and end up being worse than the original problem - although this isn't true of Fire Ants, they've sneaked in on containers, apparently.
I'd rather the snakes, because most of the worst, are safely up in Queensland!
The European Wasps are another nasty one, I was stung multiple times a few years ago and they are spreading too. Invasive too and their biggest problem, is that they can sting multiple times each, unlike natives and bees.