Watched the third part of the Hobbit, Bard's kid kills them with ease, one arrow from any bow ko's them, and the dwarf guy from the iron hills headbutts them tenderly and they peacefully die.
same reason y bearded fighters have glass chins
to paraphrase Jake "The Mus"
"too much weights, not enough speed work - useless pricks"
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Because the characters have super human strength in shit. It's the same shit with anime and other works of fiction.
Anime and cartoons are the most guilty of this though. You'll see a non action/super power based series with characters easily dodging bullets and defying physics and all sorts of silly shit.
Yes, it's glorious