"you imply that my arguement is not rooted in actual evidence. I think it is good to let people know that there is strong evidence to both our points"
Uh, what was your argument? That seratonin can fluctuate with sad and happy movies/experiences? No argument there. Everyone now is well aware. But where did your research indicate that everyone is born with the same, adequate level?
You say that "Biology has never been proven to CAUSE mental disorders", but that is dead wrong. Ever hear of schizophrenia, bi-polarism? We are just beginning to scratch the surface of brain activity. Many more surprises to come!
Just as respectfully, but hope you are also capable of coming out of your box and learning something new,