You appear to compare a 717 page book on the subject of contributors to human behavior with two editorial letters, each limited to 250 words. Then you call the latter two pieces "reductionistic".
Nowhere in Mr. Straton's letter does he indicate that emotion and rational thought are the only determinants of human behavior. He does state that: "But the human brain is far more than that, including a capacity for rational, well-informed decisions..."
Then there is the "myriad contributors to behavior" you cite that is not even an exhaustive catalog. It's a bit like knowing that there are about 7,500 varieties of apples in the world but what really matters is choosing from among what's available at your favorite supermarket or grocery store.