A trial is important so it can be seen that the government is not randomly picking minorities (and Hindus as well incase of the 1993 blasts) off the street and killing them. The problem is the 15 people who are absconding, accused, almost certainly living in Pakistan. That is where we need to send them a message that we will get them no matter where they might hide. That is where we are a SOFT state. Learn from Israel. We cannot send troops across because we don't have blanket US support like they do. But we can definitely cause accidents to happen to those hiding in Pakistan.