Nice overgeneralization. There is no law which requires to put your name on the door bell, and people are just as mindful about their privacy (or not) as anywhere else in the world.
In Germany it's probably just more likely that your privacy is actually upheld by the law when push comes to shove (especially against privacy-invading companies).
In Germany it's probably just more likely that your privacy is actually upheld by the law when push comes to shove (especially against privacy-invading companies).