David and Goliath is such a good story because everyone knows that Goliath normally obliterated his opponents.The Philistines thought the same as you Notch.
If size mattered to David (as it did with the Israelite's) he wouldn't have had the courage to take on Goliath. Especially with just a staff, 5 stones and a sling. David knew size doesn't matter, it's HEART, COURAGE, and COMMITMENT that matters.19 Jul 2015
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5 Powerful Life Lessons from David and Goliath - Addicted 2 Success
Also, David was wrong, it was appropriate use of ranged weaponry that made the difference.
Finally, it's a work of fiction. You might as well say that trusting the force is the key to success.