IMHO the biggest strength is not anonymity, but transparency. Privacy is great, and should be protected, but we live in a culture of laws we create. Law enforcement can be given the tools to make every Bitcoin transaction transparent and traceable. No more money laundering, no more incentive for organized crime. Don't give me the Big Brother bullshit, that boat sailed long ago.
Police state for the winz. Privacy should be protected by using the Police to snoop in on every transaction. Yeah no Orwellian double speak there.
The second best attribute of Bitcoin is security. It can't be stolen if properly stored and backed up. No FDIC needed. Mugging would be rare for people that don't wear jewelry.
That is just nonsense.

If the authorized user has access to his funds then an unauthorized user can have access to the same funds by "convincing" that user to release them. "Transfer the contents of your wallet to this QR code or I blow her fraking brains out". Pretty much the same thing as today except numbers instead of pieces of paper.