Whichever statute one likes to use, it is a simple fact that your country cannot 'disappear' you. You might think only tinpot regimes such as the one in Argentina some years ago would 'disappear' people, especially political opponents, or in Europe during the Herzegovina conflict, but actually the shock is that it happened in a country we commonly like to think of as an advanced Western European Democracy. OK, so it was a knee jerk reaction to 9/11 and the US wanted Saudi-Arabic types suspected of being behind the plot rounded up. However, Sweden whisking the two Egyptian nationals off the street, who were there quite legally, at the command of the CIA and without any court order or warrant may have been 'understandable' in the circumstances but it doesn't hide the fact it was a 'disappearance' as set out in the Rome Treaty 1998 edict.
This is relevant because it shows that with regard to the claimed disappearance of several senior crew of the Estonia in 1994 and Carl Bildt working with the US to encourage Estonia the country to join NATO asap shows that Sweden had done it before, if this is what happened.
IMV it is important to establish whether these crew members, including Arvo Piht, were disappeared. Now that the Cold War is over and Yeltsin's glasnost long gone with Russia once again threatening the west, maybe it is time to declassify this information and reveal what happened to those guys.