I have no idea why Seth Rich's parents' reaction is this callous. If they were frightened or were relieved their son was killed, wouldn't they just be silent?
Who would want to stop focus on the case? Obviously the killer or killers or those who benefit from the killers not getting caught.
“What disgusting parents! Their reaction is not normal. Rarely do parents want the murder of their child go unsolved.”
I see it differently. The parents DO want the murder solved, but think how it looks from their point of view as Democrats. Democrats consider Wikileaks to be an evil propaganda arm of the Kremlin. It is simply unimaginable to them that their son would be the leaker.
So, they wouldn’t need to be paid off, threatened or brainwashed - they would already be predisposed to dismiss any theories involving their son being the Wikileaks leaker. They would simply not believe it. To them, any suggestion that Seth was the leaker, helping Trump, hurting Clinton would sound like the most preposterous, alt-right, nut-job nonsense, lies and conspiracy theories.
It’s as simple as that.