Why do people in tv commercials seem happy? Because the company sponsoring the commercial knows that people will be attracted to smiling people, who seem happy, and will be more likely to be convinced by them to do what they are promoting. They will buy the product being sold.
Does that mean that all the people in the commercials, on tv, in movies, in Hollywood, are actually happy? No!
Why do missionaries smile and make as if they are happy, and talk about love? Same reason, It is good for sales.
Why do salespeople in stores smile?
Why do followers of Dale Carnegie smile?
It is foolish to conclude however, based on such appearances, that those are the happy people in the world, who have the truth, who should be emulated.