Not only are they scared of the reaction when it becomes apparent to all that there is not evidence but they are scared of where the actual investigation may go: the assassination of Seth Rich...
For which there is FAR more evidence then the ludicrous conspiracy crap between Putin and Trump.
As nice as it would be for this whole thing to blow up in their faces, if this starts heading toward Rich, it’ll be shit down in the blink of an eye, Mueller and his staff could end up getting whacked and all the evidence will disappear or destroyed in a fire.