That's no mystery, that's Sven.
Why he darns machine-made socks though, is a mystery to me. But, hey, whatever. It's not like he's asking me to do it. The sight of him bending over a thread, needle, and a pair of machine-made socks caused me to think. I make socks and I never darn their holes. My opinion is, why fix the holes when you can use it as an excuse to buy more yarn?
So, in the interest of sharing, I ask all of you, dear readers: do you darn your holes? [Here's where I should get all clever and got to some online place where I can create my own poll. Nope. Let's go low tech. If you care to answer, please do so in the comments.]