I 100% agree as I mean US v. Nixon says it doesn't cover criminal activity yet here were are, with it covering criminal activity. Courts and rules don't work when the branch that enforces them decides it no longer cares.
I think what we really need is some sort of amendment giving Congress enhanced law enforcement powers when it comes to the executive like some explicit carve out of inherent contempt powers and an enforcement mechanism like their own police force, etc. that can be used to arrest executive branch officials.
What we have now is clearly broken, but I would also worry about giving the Benghazi committee it's own police force.
Root cause is one party is hopelessly corrupt and shamelessly partisan.
What can you do to counter that?
DOJ reform is clearly needed, but I'm not so sure a whole Constitutional Congress isn't needed to fix the systemic flaws in our current system.
From gerrymandering, the electoral college, power of minority rule in Senate (by States vs population), brazen voter suppression &/or disengagement, life terms for scotus, and very importantly, the unchecked influence of money in politics... To name a few.
Of course the problem is so big is unlikely to be solved... But I think Trump had exposed fundamental weaknesses of our system that his successors will be able to exploit even more successfully.
Sad times for our nation.