Administrivia: Default Answer
"Because the plot needed it so".
That's the default answer for some questions on the Headscratchers
section. Question such as:
And if you want to go Smarty Pants on us, the more cynical version of the answer is: the writers decided to put it there (and as far as fiction goes, they are gods).
See also the Anthropic Principle
and the Theory of Narrative Causality
, and always bear in mind the MST3K Mantra
Except if you're in Real Life
. Then the answer may be:
See Also: Idiot Ball
. Yeah, now you know. And Knowing Is Half the Battle