Have you never been to a room full of people/children? If there aren't these 'control freaks' in the room, then it gets louder and louder until to the limit where nobody can understand anything while all are shouting. It's surprisingly fast, about ~2 minutes to the maximum/stable loudness. This 'control freaks' are the requirement to allow children to have a conversation.

in small doses, but I've seen them go overboard to the point where we are better off without.