If I recall correctly, Seth Rich did not die right away but after about an hour in the hospital. He was shot at like 4:30 in the morning after spending time in a bar which closed at 1:30 a.m. I have no idea where he was or what he was doing before he apparently was accosted hours later, fought, was shot in the back and abandoned. This was not an obvious “hit man” job, and could easily have been a robbery gone wrong, where some asshole criminals panicked after killing a victim. Police were there in a matter of minutes so a killer / robber fleeing immediately after an unplanned shooting is reasonable.
The family sued FOX successfully getting a 7 figure award for them spreading conspiratorial stories without evidence. They did not oppose an official investigation, which the police (not FBI) took charge of as was normal in cases like this. The family may even have their own personal reasons to oppose the public looking into their son’s personal life and computer files.
I certainly cannot prove what happened … one way or the other. But those who insist this was a “DNC assassination” of one of their own have no evidence at this point, outside of their imagination and conspiracy weaving.
I don’t trust the FBI, the CIA, or the DNC at all. But then I also don’t trust crazy right wing conspiracists who have convinced themselves there is more here than a robbery gone wrong.