What if there's evidence (maybe a lot of it) but no prosecution because the DA won't? Leave the man be?
Well... yeah. Not sure what else you can do. If we can't all agree that innocent until proven guilty is still important then we have a much bigger problem than shady shit possibly going on in one family, however famous. Once that agreement to trust the system to decide guilt or innocence breaks down we might as well all move to Botswana.