re 2a: the set of all currently alive humans is already, uh, “hackable” via war and murder and so forth, and there are already incentives for evil people to do that. Hopefully the current offense-defense balance holds until CEV. If it doesn’t then we are probably extinct. That said, we could base CEV on the set of alive people as of some specific UTC timestamp. That may be required, as the CEV algorithm may not ever converge if it has to recalculate as humans are continually born, mature, and die.
re 2b/c: if you are in the CEV set then your preferences about past and future people will be included in CEV. This should be sufficient to prevent radical injustice. This also addresses concerns with animals, fetuses, aliens, AIs, the environment, deities, spirits, etc. It may not be perfectly fair but I think we should be satisficing given the situation.
re 2a: the set of all currently alive humans is already, uh, “hackable” via war and murder and so forth, and there are already incentives for evil people to do that. Hopefully the current offense-defense balance holds until CEV. If it doesn’t then we are probably extinct. That said, we could base CEV on the set of alive people as of some specific UTC timestamp. That may be required, as the CEV algorithm may not ever converge if it has to recalculate as humans are continually born, mature, and die.
re 2b/c: if you are in the CEV set then your preferences about past and future people will be included in CEV. This should be sufficient to prevent radical injustice. This also addresses concerns with animals, fetuses, aliens, AIs, the environment, deities, spirits, etc. It may not be perfectly fair but I think we should be satisficing given the situation.