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From my experience in acting, it indeed is way harder to act happy than sad or angry. A smile is hard to fake.
When being paid millions, acting sad is a much bigger reach >

The real challenge is acting sad when your job makes 8 million per role >

Three words. Crying On Demand.  
Its easier to fake laugh than fake cry. >

Positive emotions are just more common in my experience.  Yeah an 8h shift can be boring but I’m not going to cry or get pissed off about it.
Most people laugh at least a couple times a day while it may have been years since you last cried if your lucky >

It’s human nature. Anything dark/subversive/depressing/violent gets far more praise artistically than upbeat/happy/positive. >

Pursuit of happiness