That is your right to not claim your German ancestry, as generally it is a viable solution to just not stand out and blend in with crowd, but frankly that is also your right to claim your ancestry and seek refuge in German speaking countries, if things go south in Sweden and Caliphate is established there or some Finns invade and makes your life impossible, so generally - this is not your gate to keep, as these can be considered as an open choices. And I would think that current age of open borders that we have now might end and claiming different identity might be the only viable option to migrate somewhere else.