No matter what the cause, some animal species DO become overpopulated. It's plain fact that at times certain species can have a population explosion and overgraze, over-predate, or over-crowd their territory.
Alligators have had a huge population explosion in the last 25 years, and they're everywhere. Is this the same population levels as before Columbus landed? We haven't a clue. No one was counting alligators then. Are there gators in places that are now unsafe for the humans? Yes. So gators are hunted and/or removed.
I haven't seen any population studies that say rattlesnakes are "overpopulated" in any place. In fact, every study I've seen says the populations are DOWN, not up. That doesn't mean the population couldn't be up, pushing extras into human areas, or that the snakes are not thriving because there's more snakes than prey item in the territory. Any species can overbreed, whether it's due to human actions or just nature's cycles.
Deer are a great example. They have cycles in the wild, breeding super well on a lush year, then overgrazing and overbrowsing so that some of the deer suffer and end up becoming unhealthy and dying/being killed more easily. That's when the cycle is in the downturn and there will be fewer deer, leading to less competition and healthier fatter deer, which produce more fawns, leading to a "boom" year... leading to the same cycle spot as before. This will happen with wolves in the area, with humans in the area, with nothing in the area. Nature has it's own ways of balancing populations. Not that humans haven't affected the natural balance, often in bad ways... but it's silly to say that there's nothing but a perfect balance without the human influence either.
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