Because The Giver is an anti-utopian novel, rules and orders are negatively portrayed. They are used to take away freedom, choice, and individuality. The citizens of the novel's overly-controlled "community" aren't even aware that they've lost their freedom. To them, the rules are a good thing; they make life easy, predictable, and manageable. It is this lack of free will that readers tend to find the most terrifying about rules and order in The Giver.
The Giver promotes anarchy.