Let's Go Fly A Kite

The obligatory link: Pakistan: 11 dead, 100 injured in kite flying festival

Okay, I expected the deaths from stray bullets. What I didn't expect where the sharpened kite strings. ... ... ... Yes, you heard me right. I said, "Sharpened kite strings."

And yes, the article is going to tell you how such a thing happens. Instead of thread, or maybe fishing line, the use of wires or glass coatings is involved. What possible reason could there be to turn kite flying into combat, though? I don't get it.