You would have to have a majority in both houses and the presidency to hold anyone accountable, even for much smaller crimes. That is where we are at.
But once that is attained, then it must go forth rapidly. With a ferociousness not seen in modern history.
Nothing will happen via Congressional “investigations”. Nothing. Even if you had the House & the Senate.
A Nuremberg style tribunal might work, but as complicit as all the governments are who would have to participate/run it, I don’t expect that to happen either.
Criminal charges will have to be brought by attorneys for those injured and those who lost loved ones. Lawyers like Thomas Renz (one great example) are working on it. Brook Jackson (whistleblower) has a good lawsuit in progress, if it’s allowed to continue ... companies are claiming gov’t knew about their fraud so that makes the fraud ‘ok’ & case should be dismissed - hopefully, the judge won’t dismiss.
I agree with a ferocious pursuit, however it happens.