Because a bad mood can literally cause a public road to wash away or a tavern ceiling to collapse, the morning-side Sovereign Concord treats intense feelings as a threat to national security.
In Concord-controlled cities, showing extreme public anger, deep grief, or loud boisterous joy is a literal crime called Environmental Vagrancy. The Syllable Guard carries specialized crystals that measure the emotional frequency of the air. If you are caught crying in public, you face strict fines. Because gold holds no value to the fey, these fines are paid in psychological currency—the elven judges will use specialized quills to legally extract the memory of your favorite meal, three months of your physical youth, or your ability to feel content for a week, leaving you perfectly neutral, hollowed out, and safe for the city's architecture.