Why doesn't Ralph blow the conch when the meeting dissolves into control?

Ralph doesn't blow the conch because he feels frustrated and overwhelmed by the chaos and lack of control among the group. The conch symbolizes order and authority, but in this moment Ralph realizes that the conch’s power is diminishing as the boys' civilized behavior deteriorates. He understands that blowing the conch will not restore order, so he chooses not to do so.