[dauertewigkeit]

It's fundamentally still a problem of asymmetry of power and connections.

Try to put yourself in the shoes of an FBI agent tasked with investigating this same case. The accused are very wealthy very powerful people with deep pockets. They can and will take action against you, if you're revealed to be chasing after them. Plus, their network of allies is so vast, that you cannot even trust your superiors or other government agencies to back you up. And indeed that is exactly what happened here.