And the answer is that unhappiness is a choice they make. That their unhappiness stems from their thinking.
Perhaps they’re not pleased with their circumstances and want them to change. Or they’re sorting through the baggage of their past - things they can do nothing about.
The unhappy among us are rarely savoring this wonderful moment our creator has given us. Instead, the thinking is somewhere else. We’re peering into the future or the past. Thinking that if this or that were different life would be so perfect.
But the only perfection in life comes when we accept the inevitability of change. We embrace the present, whether it's bitter or sweet and savor the good and the bad - which is the essence of life.
If we can do that then we’ll be happy and free.