[jessaustin]

until we are reasonably sure they don't pose a danger to society / won't re-offend

This might make sense for murder, but for most lesser crimes it's problematic. If someone is in the habit of getting in bar fights every few times he goes out drinking, would we be justified or even well-served to put him in jail until we're sure he would never go out drinking again? That could be decades!

It goes without saying that this idea is extremely problematic with respect to "crimes" against fictitious "property" like we have here.