Because they're too stupid to learn how to make them.
Triggerednometry
One to screw it in and nine to write on their blogs about how enlightening the experiment was.
Triplane fuel can't melt sea beams.
At LMN-tary school !
It doesn't matter how many you get, because all they'll do is sit around complaining about how misogynistic the use of the word "screw" is.
Crimea River
He knows where all the naughty girls live. I actually heard this in the video game LA Noire. Thought it was pretty funny so I bust it out every Christmas.
Tombr Aider