It's the government trying to enforce their opinion of who should own those Bitcoins, thereby taking power away from the owner that the network has decided on, which would be "whoever has the cryptographic keys".
Isn't this exactly how your access to digital content is mediated? A bunch of servers somewhere says that this user identifier is allowed to access this content.
There are general similarities in computers mechanically enforcing access that applies to crypto-assets and digital content. I'm specifically interested in how the legal system confers additional properties or re-enforces these properties in digital assets that legitimize the properties institutionally.