There are many pressures in modern life: the pressure to have a job, keep a job, do well at a job, to give birth a certain way, to give birthday presents, to remember birthdays, to make an appointment, to keep an appointment, to look confident, to be confident and so on and so on.
We all know that constant pressure is unhealthy and an antidote to happiness. Still, nobody suggests that there is something inherently wrong with the idea of having a job, birthdays, appointments, confidence.
However, when it comes to happiness, we like to throw the baby out with the bathwater. How is that the mere fact that people feel pressure to be happy (in the US) is reason to declare happiness to be a very bad idea? Why kick that one? I suspect that the Puritans and other religious groups have their hands in singling out happiness.
Happiness, I want to shout, is not a sin, is not dangerous, is actually really good for you, and is pretty inexpensive too. People will not lose their morals as there is no happiness without morals. They won't be selfish as happiness cannot happen in a vacuum. They won't be superficial as that is confusing pleasure with happiness.
While there are many of us who have to relax our efforts to be happy, there are also many who have to relax when pondering happiness. Happiness is good stuff. Breathe in, breathe out...