i'd just like to mention that slingers in war at the time were extremely formidable opponents, usually using bullets made of baked clay or sometimes iron, and commanded 3-5 times the base pay of an infantryman.
goliath was just a big ass infantryman.
cop in riot armor vs a redneck with a revolver
when you understand historical context it goes from a story of LITTLE GUY BEATING IMPOSSIBLE ODDS (Thanks God!) to THOUSANDS OF HOURS OF PRACTICE PAYS OFF FOR COUNTRY BUMPKIN WITH ASPIRATIONS OF GLORY
also one of the rewards for defeating goliath was permanent tax exemption, say what you will but jewish people have been earning those stereotypes for thousands of years