The problem originates with people releasing domesticated rabbits into the wild when they decide they no longer wish to care for them as pets. Unfortunately, this is almost always a death sentence for the creature which won't understand how to survive in the wild, lacks camouflage and will likely get picked off by a predator within several days. If you've ever taken a walk through Discovery Park near Seattle, you'll see a similar spectacle. Please, if you ever think about doing this, stop and bring the animal to a shelter, or try to re-home them yourself instead.