I actually see the feral cat problems that exist in every community across the USA, just as much an issue as wild exotic snakes dumped in the Everglades. Actually, my feeling is that the feral cat problem is a much bigger issue to human health. And, unlike dumped in the wild snakes, cats do not thrive in the wild.
Ferrel cats live, or I should say subsist, in the wild because humans assist them to do so. Many well meaning people and even community efforts and programs make efforts to spaying wild cats and even feeding them. While the spaying is good, its not really good enough. Its not right for these animals, that are totally domesticated, to fend for themselves outside. And there are many health risks to other native wild animals, but especially to humans.
I know I will be hated by many cat lovers, but I feel that feral cats, if they are not adoptable, should be humanly euthanized. And it should be a felony for dumping any pet animal in the wild.