personally i would release him into the community, not tagged but certainly kept an eye on, that way he will contact his followers and make a mistake, if he hasn't done so already, firm evidence of any wrong doing in this country and away he goes back to jail. You can't deport someone just because you feel like it. If he hasn't actually done anything wrong, at least that the public are aware of, what can the government do..
i heard earlier that the matter is still open and that they are not giving up on getting him deported, well good luck with that, as he has been here for 20 years.