It's definitely not an immediate solution, but my best guess (and it's definitely a guess :]) would be that they imagine after the initial mass release into the wild after the ban, that since "no one" would be acquiring the snakes anymore the threat would diminish and disappear over time. Maybe the beginning boom of potential release was worth getting rid of that potential for the future?

Just a guess. I really don't know. I just like posting other input into things. :] We're all like-minded so it's fun to throw a little disturbance in there.