Linguistic humor, Name change

The Germans invade Alsace, and require everyone to take a German name. A German soldier goes up to a farmer by the name of Lagarde and informs him of the requirement.

Lagarde refuses, arguing as follows:

Look, 'Lagarde' in German would become 'Wache'. La garde in French means 'the sentry', which translates into German Wache 'sentry'.
In a few years, the French will reconquer Alsace, and then I'll have to to by 'Vache'. French speakers would pronounce Wache to sound like vache, the French word for 'cow'.
Then you guys will come back and make me change 'Vache' to 'Kuh.' The German word for 'cow' is Kuh.
Then the French will come back and make 'Kuh' into 'Cul'. French speakers would pronounce Kuh to sound basically identical to cul '(ass)hole'.
Then you Germans will come back and make me change 'Cul' to 'Arschloch'. The German word for 'asshole' is Arschloch.
So why not just call me 'Arschloch' from the get go?