There is yet another angle on this dilemma which hasn’t been raised yet. How bad is the outcome you are willing to prefer, in order to avoid those 3^^^3 dust specks? Are you willing to have the torture victim killed after the 50 years? How about all life on Earth? How about all life in the visible universe? I presume that truly convinced additivists will say yes in every case, because they “know” that 3^^^3 dust specks would still be incomprehensibly worse.
There is yet another angle on this dilemma which hasn’t been raised yet. How bad is the outcome you are willing to prefer, in order to avoid those 3^^^3 dust specks? Are you willing to have the torture victim killed after the 50 years? How about all life on Earth? How about all life in the visible universe? I presume that truly convinced additivists will say yes in every case, because they “know” that 3^^^3 dust specks would still be incomprehensibly worse.