OK, thanks for that. But the case remains that seizure of BTC, even within compliant jurisdictions, even in a world in which "we tortured some folks", is largely unenforceable. No?
If it is not enforceable by other means, it is certainly enforceable at the interface with fiat, in any AML/KYC-compliant context. If the BTC economy were severed from the fiat economy, it would become irrelevant to most of the purposes for which bitcoin is currently and/or potentially important.