While there may be a lot of minorities over represented in the Penal system -- you get on the wrong end of the law and you are suddenly one of the minorities. If you go the route of contesting your guilt, you face higher penalties fines and punishment than if you just cop a plea. Being innocent is painful and expensive. How many people just say; "You are right, I'm a bad boy" because it was bankrupting them? Only people with means can afford to be innocent. It's easy to believe the system is fair as long as you never get on the wrong end of it. The accusation becomes the reputation which rationalizes the punishment.
I can't imagine if the Feds wanted to make an example with me, and their credibility were on the line. "Tipping the scales" because they want to make an arrest easy and 'get the bad guy' -- I can imagine that happens more often than not. There's a lot of financial and career pressure on enforcement -- and I'm sure to get cyber criminals and whistleblowers, regardless of merit, is even greater.
As someone said; it's probably got little to do with investigation, and more coercing people to give up associates who MIGHT be guilty, and then leaning on them until they get somewhere. Like the drug war, that friendly recreational drug dealer that supplied your party gets squeezed and their life ruined to get SOMEONE. I suspect intimidation and thuggery is more useful than detective work.
So, suffice to say, if your parents aren't totally politically connected and rich -- you aren't the precious white boy if you are a nerd in the cross hairs of the Fed or NSA. You are at least going to be collateral damage because Uncle Sam isn't spending a few billion on this agency not to have results. Again, just like the inquisition finding a witch -- it doesn't matter if you've actually consorted with Satan.