You can actually rule out a WHY, by explaining HOW.
So, if I presented a computer to a noble savage, he would most likely deduce that it had been created by Gods, and it had been given to him, so that he could rule the world, and bring his new computer religion to the world.
Explaining HOW the computer actually works to him, would tend eradicate his previous explanations of WHY it existed.
In the same way, the orbit of the moon was previously believed to be part of a divine plan, enacted by God. The moon moved on a crystal sphere in the heavens, supervised by God. Newton found out HOW the moon actually moved, and that destroyed WHY.