The problem you have in the USA is the people investigating the perps are related to them.
The USA is run by a crime family which are all descendants of King John Lackland, younger brother of Richard the Lionheart.
All US presidents except the 8th are from this family. Obama and Trump are related, they all are.
The Supreme court is 80% from this same extended family.
The family owns the US Media and the US Defense sector corporations.
They pay out once a month on all the dividends from the family assets. That is what keeps them in line.
The heads of the Military are from the family.
Same with the Intelligence and counter intelligence, run by The Family.
All those well bred families of the east coast and Martha's vineyard. That is who they are in public.
Politics in the USA is a puppet show between them.
They make themselves rich by awarding government contracts to themselves, transferring taxpayer wealth to their own private wealth.
Because they own the media between them you can't even get this out there. If the people knew they would remove them, so that is their main priority. Making sure you can't get rid of them.