The point is that David did not get away with murder
FM; typical fisherman's story about the one that got away, told with straight face and outstretched arms.
remembering that this is all part of the ongoing talking snake saga, to be taken with a pinch of salt, like all fishy stories,
david did not pay the price demanded by the law that applies to every human, pay with his own for the thousands of losses he caused.
the lesson is, that stories like this, if believed, do terrible things to the minds of those involved,
"woe to those that say bad is good. "