Captain Kirk was a terrible fist fighter. I can’t think of a single time Kirk ever singlehandedly beat someone into submission with his fists. He always had other crewmen, or Spock was there to hit them with the Vulcan nerve pinch. Maybe ending an episode with the captain just punching an alien in the face until they cried uncle wasn’t deemed heroic enough.
It has always struck me that in Star Trek (and now on The Orville, A TOTALLY DIFFERENT AND DISTINCT SHOW!!!) humans are the most feeble, least ferocious sentient creatures in the galaxy. Except maybe for the Ferengi. I dunno. They do have those sharp little teeth.
On Star Trek: Discovery, there’s a creature who they state many times is from a prey species. He talks at length about how his people can sense death, and live in constant fear. Well, it turns out he can also crush a communicator with his bare hands.
If Star Trek were realistic, humans would not be in command of all the Federation ships. Their primary jobs would be as an emergency source of protein.