Just some observations: (1) These "people" are not rocket scientists. Anyone with 1/2 a brain realizes that a kidnapping brings in the FBI. The FBI has enormous resources. Same as bank robbery. Federal offense. FBI has it's issues but if they are looking for you, especially something as serious as this case was, they will find you.
(2) Unless you are some type of "Rambo", trying to handle something like this without LE and the Feds will not turn out well. Granted this did not turn out the way all of us had hoped, but unless you have very good intel on these "people", have additional help and exceptional skills, LE is your best bet.
(3) LE has some, if not all responsible, and will turn them over to the court system. The arrests may continue as more info surfaces. That is all they can do. Hopefully the system will handle these "people" as they should be handled. If they are in anyway involved, they should all face the same consequences. Lets hope they get everyone involved and set a STRONG example for anyone contemplating anything like this again. IMO the "people" that did this do not belong to the same human race as the rest of us, I have to hope.