This, in turn, protects sources of information (snitches) and methodology / technology of and for intelligence collection.
So, other than protecting LEO and LEO Intel types, it doesn't do much.
We're talking about an international police organization that is now allowed to operate free of 4th Amendment constitutional constraints within the United States and to collect information on US citizens that can later be used to support the arrest and prosecution of those citizens. If the case is prosecuted outside the US, then the US citizen who is being prosecuted will not have the benefit of US constitutional protections at the prosecution stage either. That is the very definition of a secret police.
Our own police forces do NOT have this immunity, and for d*mn good reason, too! Why the h*ll should free men tolerate allowing Interpol to run roughshod over our constitutional protections in this country?
What a sackful of phony hipocrites this desparate administration is. They are reaching far beyond even their imagined ideas of Bush "sins" with their own actions. They think we are not watching and contemplating retrobution...