It's all about ignorance. Have you ever wondered why police don't generally just bust into your private home? Why do they (most of the time) have to get a warrant before they can search your private home?
It's because law enforcement and government are for public protection and regulation, not private. There are 70+ strong US Supreme Court cases that force government to stay out of your private things. Plus, there are the 1st and 4th Amendments, as well as the 9th.
No-knock raids are based on Grand Jury findings, and a judge signing a warrant. SWAT and police don't simply decide that today they are going to do raids at this or that house. They can't simply come onto you private property without a warrant, or at least some kind of judge-signed document.
What does this have to do with Exchanges? One major thing. Make the exchanges private, and they will be outside the reach of Government. This doesn't mean that law enforcement won't try. But done properly, LE will lose in court. And when they lose, they will get slapped a bit by the judge, and they won't be overstepping their authority again.
It's not that the exchanges are not private already. But, it is that they haven't stated their privacy. For example. A State might have laws against prostitution. But a Gentlemen's Club can bypass those laws legally by becoming private. How do they become private? Here's how.
They write up a private agreement for members. If somebody (including the prostitutes) don't sign the membership paperwork, they aren't allowed. But if they DO become members, they are required to keep the operations of the Club private, not revealing what is done within their private doors.
What is this kind of private agreement called? It's called the Private Membership Association (PMA). Google and Youtube search on it.
If an exchange (which is essentially private, anyway) wrote up a PMA agreement, and made all their members sign it before they could do exchanges there, the exchange could be made to be outside of the reach of governmental regulatory agencies. In addition, every time there was an exchange being done, it could be done as a separate, written up PMA. This would make it a PMA inside the PMA exchange, so that there would be double protection.
It's not the fact that the exchanges aren't private. It's the fact that the privacy isn't written into their operating bylaws properly so that they are protected. In addition, it's that the members don't realize that they are protected, and how to fight it properly when government assaults their privacy. PMA leaders have the answers for all this. Search on it.