I don't think we need to adopt any kind of a hard-and-fast rule prior to putting people in jail.
Ultimately, the King gets to make decisions on how to proceed with the people in jail. He can either hope his 20% scan comes into play and let them live or he can gas them. Pretty simple, and it is his call every day.
Meanwhile, I think that if there is not a person in jail and we don't have a clear lynch, or a 1:1 trade option available, then we stick someone in the jail and let the king decide how to proceed. Part of voting someone in as king is giving them some license to make decisions. And then we get to second guess them when they are wrong
