There are only two categories of happy people in the material world: fools and transcendentalists. Fools are so oblivious that they manage to convince themselves that they are happy in this material prison. Transcendentalists are happy because they can see above the material dualities and know that their parole is at hand. Everyone else is essentially miserable. This is because calamity in the material world cannot be avoided, just as water cannot be avoided in the ocean.
Reference: Spiritual Warrior III: Solace for the Heart in Difficult Times, Chapter 6 – A Spiritual Warrior's View of the World