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".
People standing ready to buy legitimizes crypto as property. I don't love crypto. But prohibition has never worked as intended.
Since you brought up prohibition, I'll take the bait. We already have prohibitive socio-legal constructions which few people use to form the basis of "prohibition has never worked, so we should not prohibit it." Some examples that are socially and legally prohibited are: murder, rape, incest, slavery, torture, buying and selling of children. I'm unsure if you believe that the prohibition of these acts has also never worked as intended and should be left unprohibited.
Prohibition has doubtful effect in US on even universally hated and criminally suppressed content like CP.
Allow me to rewrite since it wasn't understand I was replying to your question:
I would be convinced to change my mind if you could cite prohibition against inanimate data that maintains the 4th amendment protections in US while simultaneously thwarting those determined to share and manipulate that data.
My understanding so far is that "I currently believe prohibition of inanimate objects has no effect. If supplied with this evidence, then I would believe prohibition of inanimate objects would have an effect."
edit: also under what criteria would be used to judge whether a prohibition "maintains the 4th amendment protections in US"? Any specific relevant cases? If I go hunting for evidence, I want to make sure the goalposts are not moved.