I too applaud you for rescuing these wonderful little guys.

The sad fact may be as simple as the owners losing their job in these tough times and no longer being able to afford the snakes, so they turn them loose.
Not much different than the thousands of dogs, cats, ferrets, etc. that find themselves homeless or stuck in a shelter for the same reason.

Or it could be boredom, how many people get a cute little puppy because they "have" to have it, then when the puppy gets bigger and potties all over the house and destroys the furniture and isn't cute anymore, they don't want it. Maybe these guys were purchased as babies because they were cute and how hard could it be to take care of a snake? Then they got bigger and more expensive to care for, and the owners no longer wanted the hassle.

Whatever the reason, they were very fortunate to be found by you, and I'm sure no matter what you decide, they'll get good homes.

Gale