Glass Half Full

I notice that some people just tend to regularly respond in the sense that the "glass is half empty" to something even if it is trivial.

I wonder if this is a result of cultural and traditional influences.

A whole group or generation of people may have been influenced in these ways and continue to be.

On the other hand, we have people who view things as "glass half full."

How are their successes? Are they happier? Indeed.