But how could Strongcoin.com be sure that the owner of the strongcoin account was really the thief?
Maybe - unlikely but still possible - the holder of the strongcoin account bought this amount of bitcoins by cash (not knowing that they were stolen). He also is not obligated to tell the truth to the strongcoin admin of how he got the coins. So maybe strongcoin admin took away the coins from an honest owner.
All this is just speculation (and probably very unlikely), but I just want to make a point here. Strongcoin just lost all its trust by this action (imo).
john
It seems that the proofs where quite credible.
Anyhow, we all know that it's not the admin of a service who has the right to decide and seize funds - that's authorities task.
I hope everybody takes this as an example of a very important lesson: never leave more than pocket change in third party services, regardless of how secure they seem (Google authenticator, Yubikey, whatever). And remember also that in the Bitcoin world, today's pocket change can be tomorrow's retirement money.