They drop the ball because they want to drop the ball, they aren't really serious about this.
It doesn't appear to be so. Guys like Strzok in high positions and great authority don't get to weasel out of stuff. They either 1) committed deliberate action and covered it up, or 2) are incompetent.
Dealing with guys like this, you give them a binary choice, neither of which are good for them. You don't let them sit there and smirk and wordsmith and rebel against you like some Jr. High punk, you do that to them.
Then you stab the SOB over and over like a street thug till you gut him open and then mock him that he get up and stand. Strzok should have never come out of this looking like completely sleazy and dirty, or a worthless boob.
Is there anyone in this country with cock and balls anymore?