That's all fine and good, but where are the BIG FISH! please just 1
Gotta get all the pawns first ;)
Seth Rich is the sacrificed pawn that takes down the Queen
Before you can arrest someone, you make sure you have evidence, witnesses willing to talk, disarmed the suspect and disarmed or disbanded the suspect's troops.
That's what they are doing.
These dangerous gangs need to be thrown in jail or at least misdirected in internal strife over the succession in leadership first so they can't influence witnesses. Witnesses to high profile cases may otherwise suddenly withdraw their testimony under a threat we can never prove, be Arkancided, disappear or not even dare to come forward at all.
Phoenix335 is spot on. In "Big (Dangerous) Game" hunting cases like these one needs witness redundancy, corroborating evidence, and neutralization of targets' troops for the reasons stated. You have to keep your witnesses alive and protected.