Humanity's happiness as the species' purpose in living is selfish in itself. Our happiness is not the reason we are created upon this earth. If it does, then we should've just been given a very low iq enough to survive. Increase intelligence widens ones view so happiness is shot. Ignorance is bliss really has a grain of truth in it. What i think of our purpose doesn't matter. Since we are actually advanced enough to figure it out. Only thing is we hope that we live long enougj to fulfill it.
Yup. The higher our IQ is, the more serious we tackle things out. Just like watching a comedy movie, if the joke was already been done in the other movie, then it's boring, there should be something new. Or another example, a woman, if they are into sexual relationship, the more experience they have, they would need a much better man to be with to make them happy in bed(no pun intended). Or a poor man seeking for their day to day living. They tend to work harder and harder to make their lives easier, and that is the only thing that makes them happy.