Letting your cat outside unsupervised is highly dangerous. Your cat is at risk of:
• Being attacked, or even eaten, by predators (wolves, coyotes, bobcats, dogs, snakes, owls, foxes, alligators, etc.)
• Getting in fights with other cats, who may even be feral
• Contracting and spreading disease and parasites
• Being hurt or killed by cruel people (being poisoned, used as bait by dogfighters, being used for ritual sacrifice, etc. I live in Texas, where if your animal is causing a problem in a rural area, people WILL shoot it and don’t give a fuck)
• Dying of thirst or hunger
• Dying of exposure (freezing to death, overheating, etc.)
Also, I noticed that you have made posts about your concern for endangered species, and as @acti-veg has stated, outdoor cats are disastrous for the environment because they are causing the extinctions of local populations of birds, rodents, lizards, etc. If you claim to care about the environment and about conservation, you should really rethink your stance.
It’s not that hard to supervise your cat when they’re outside. Why do pro-outdoor cat people just adamantly refuse to put the smallest amount of effort into this? You don’t have to get defensive. Just stop letting your cats outdoors by themselves and try to come up with some better ways to keep them entertained and stimulated.