>>6You asked.
Why would an advanced brain cause problems in the human psyche?
Why would a parent punish their child? They love them so why would they do something to make them unhappy?
Why would a body builder put their body at risk by lifting heavy weights?
Why would a student push themselves mentally beyond their ability even if it makes them unhappy?
Why does a doctor give administer vaccines? (not that I like them)
The answer to all these questions is to make you better.
Back to your question.
Why would an advanced brain cause 'conflict' for humans through the human psyche? (Well that's basically your question anyway.)
It's to make us advance further in survival, creativity,fun, and happiness.