When you were growing up, the previous generation of German businessmen gave up some of their profits to pay for your education and health care, and to ensure that you grew up in a relatively safe and pleasant environment. They did this with the expectation that you would in turn pay for the following generation.
I wouldn't go so far as to say that you should be forced to perpetuate the system. You didn't choose where you were born, and if you think the system in place there is wrong you should be free to leave. But you've benefited from the generosity of others, and now by moving to a country where it's cheaper to do business precisely because it doesn't offer its people the same advantages that Germany does, you're ducking out of repaying that debt. Have you thought about other ways to pay it back? Or do you consider the previous generation to be suckers for paying your way without making you sign a contract first?
Odds are his parents are net tax contributors, including whatever the state spent on him. Only people with poor parents really owe what they got to the state, as opposed to productive people like their parents.
I wouldn't go so far as to say that you should be forced to perpetuate the system. You didn't choose where you were born, and if you think the system in place there is wrong you should be free to leave. But you've benefited from the generosity of others, and now by moving to a country where it's cheaper to do business precisely because it doesn't offer its people the same advantages that Germany does, you're ducking out of repaying that debt. Have you thought about other ways to pay it back? Or do you consider the previous generation to be suckers for paying your way without making you sign a contract first?