And I responded to a comment which was simply saying "Just send them home". That can't be done for "them" all.

I believe there is a wide variation within those imprisoned: some are innocent and were captured by mistake or worse (e.g. rivals were turned in by jealous neighbours, or whatever), others are actually hardened fanatics. And it is very difficult to know who is what.

And since when is being a "hardened fanatic" a crime? As long as they're not otherwise engaged in criminally acting that out, who the fuck cares what they think? If there was any actually solid evidence for anything real against them, they wouldn't be in limbo, would they.