It's like supporting your family isn't it? If the tragedy is in front of you all the time it's only human to want to do something about it.

On a political point, I do think that any investigation helps the criminal justice system with profiling, understanding criminal habits and tendencies, gaining experience, networking and making the world a smaller place as criminal trade routes are discovered.  So there is an argument for taking it on as it can only help with current and future cases.