"As always I'm amazed at the cult like nature of the 109 aficionados"
It's not so much the 109, it's the German war effort in general. The Germans have always had a certain kind of perversely glamorous attraction for some people. Back in the past, punks and bikers used to dress up with swastikas, iron crosses, and "stahlhelms" because it was transgressive to do so. Nowadays the same people are older, and they spend their time on alternative history sites, arguing about how Germany might have won the war. Or they trade videos of overweight modern-day men dressed as German soldiers, firing MG42s from the hip. Etc. It's geeky, and it's a little bit transgressive, and so it has a powerful appeal for people who don't get on with mainstream society; science fiction and fantasy fans, if you know what I mean. The kind of people who enjoy Warhammer 40,000.
Typically the re-enactor, enthusiast, amateur scholar etc justifies this by saying that he - and it is always a he - is merely honouring the brave fighting men, rather than supporting a particular political ideology. It ends up with the same people getting upset about Dresden and Rudolph Hess, and then calling their daughter Helga, and after that there's a short step towards the line of no return.
Besides, German kit typically looked meaner than Allied equipment. The 109 looks nastier than a Spitfire. It has a little square welding mask porthole where the man looks out. German bombers looked like evil insects. A Tiger tank looks dangerous, whereas a Sherman looks like a child's toy. German equipment was typically more angular than Allied equipment. The logos and iconography were starker. The words sound threatening; "minengeschoss" and "rüstsätze" and "obersturmbannführer" have a certain ring to them. The German officers wore long leather trenchcoats and big boots, who could fail to be seduced by that?
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"You were bred and led yourself"