It doesn't seem to me to be very "easy" (or very efficient for that matter) to seize every rebarrelled Marakrov in the nation in order to solve a single murder no matter how heinous. How many man-hours have been spent on this that could have been spent on other more pressing crimes?
While the feds may or may not give a rat's behind for the murdered individual, they place supreme importance on solving murders against members of law enforcement and the judiciary. In short, it's the position not the person they care about in this case. We cannot end up like some third world country where judges and juries have to wear hoods in order to avoid retribution for adverse verdicts. An attack on our judiciary is an attack on our entire justice system. As flawed as it is,we are a dang sight better off than most nations. If the feds would only go after corruption in the judiciary with as much zeal I would be much more pleased, for I regard corrupt judges as evil as criminal gangs who try to intimidate honest judges and law enforcement personell.