Of course not all Germans are autistic, but I can't help but think that maybe a larger percentage of them are. And by extension, maybe the German cultural values simply started to accommodate that after a while.
I've traveled around a bit, and I know quite a few Germans, mainly because you always seem to run across a large group of them in every country you visit. Sure, I've met Germans who were really social and affectionate, but I recall most of them being at least shy if not outright antisocial, and yes, very picky about having things in order and routine. An Austrian (also a Germanic nation) I worked with while volunteering at a retreat center once spent six hours washing windows, trying to make them spotless. Eventually the head housekeeper just told us to go and get him.
I also went to Germany (Kiel/Hamburg) for a weekend to visit a guy I'd had a huge crush on for a couple years. I left out of London and had spent the day before in Liverpool, lugging around two large suitcases because I had no idea there were any such thing as train station lockers. (where's the "dunce cap" emoticon?) In Liverpool I had people stopping every five minutes asking "Are you all right? Can I help you with those?" Whoever said Brits were reserved and aloof--not true. Two days later I'm in Kiel, dragging the same two suitcases around looking for the hostel, which took forever to find since it's in a rather odd (but beautiful) location. All I get are weird stares...and even somebody snickering at me.
Not to mention that "Mr. Wonderful" himself was never too much of a social butterfly. I feel kind of bad in retrospect for intruding on his space--he tried so hard to make me comfortable, he meant well, but I got the impression that I was pretty much just disrupting his routine and that this sort of thing wore him out. He was basically dragging me around, saying things like "First we will see this and then we will do this...." in the sequence he wanted. Oh, and he ate the same smoked fish sandwich with the same sparkling apple juice for lunch both days I was there.
I've also seen a German guy on a different message board who pretty obviously has AS, even though to my knowledge he's never said so. Ever seen My Fair Lady? He's Henry Higgins. And yes, he really is a linguist. And yes, he will nitpick at your tiny errors and argue to the death about pointless details.