Bitcoin wallet can be seized and the transactions are traceable and public, so a sufficiently determined actor can figure out who has it and how much.
Then enforce their cut with violence.
I would quibble with this, depending on how we define "seized". My understanding is that your coins cannot be transferred unless the transaction is signed by your private key. So, authorities could seize the computer that has the private key on it, or, as you say, use violence against a known individual, but they have no way in-network to take your wallet. Compare this with the central banking system where governments can and do force banks to freeze or hand over their customers' assets.
The NSA was able to infect air gapped Iranian computers 100 ft underground that only a handful of individuals had access to. I doubt any hot wallets are really out of Government reach given enough time and attention. A cold wallet with offline multi sig - more likely.