I said that keeping in consideration that if the person is not co-operating with the law during an investigation, he is giving an opportunity to authorities to adopt another strategy. Is it not a responsibility of an investigator to collect the evidences and present to a judge to deliver justice to the victim? No need to use force, if a thing could be done peacefully, we all know this pretty well. Recently, in Ontario, Canada, a 8 year old girl went missing in the month of April. Yesterday, a couple got arrested for her murder.
Six weeks after Ont., girl Tori goes missing, focus shifts to recovering her body - Yahoo! Canada News. I expect that arrested couple to "co-operate" in telling the police about the dead body of Tory so that police could be saved from exhausting search and could invest its energy in solving other cases.
Second thing we should never forget that as a Christians we are expected to live our lives with some expectations, however, as an individual Christian, every one is exceptional. Beside religion, culture also impacts significantly a person's life. In OT times, murdering someone was not "very wrong". Even Lord God was with His people during fights and wars. Did David, Samson, Joshua and others not killed people? Make me aware of a war where people were not killed.
This might be another debatable thing that, if we are told `Thou shalt no kill`, why do Christians join Military or Police services because while in action, killing someone in those services is inevitable at sometime or the other. However, I am neither justifying killing not supporting it.