In The Giver, why would Fiona, a trainee in the care of the old, probably accept the practice of releasing the old?

The only people in the community who know that release means putting someone to death are the Elders and the Giver.  Fiona has no idea that the elderly people she helps to care for are being killed. No one is present when the elderly are released except for a committee, one probably composed of some Elders, that is in charge of the process. It is also possible that, as in the release of an infant that Gabriel witnesses, a caregiver like his father will perform the actual release.  As far as most in the community know, people who are released, young or old, "were sent Elsewhere and never returned to the community" (43).  It is difficult to know what Fiona would do if she understood this, but since she does not, she pictures all who have disappeared from the community being Elsewhere, and thus there is no reason for her to protest the process or be at all concerned about it.  Additionally, this is a community in which people are almost "programmed" to follow all rules, and Fiona is probably going to accept any rules or processes that the Elders require.