IMO, that's currently the best theory of why we're going through this 2 year shitshow. We can't get 'em for what they did, but their desire to get their power back, which necessarily means covering up past crimes even if they are immune*, meant it was all but a certainty that they'd continue the crime spree.
*The optics of their criminal behavior in the past would effectively make them pariahs, ending their global domination efforts even if there aren't any legal repercussions.