German army was not "clean". They were involved in various atrocities. Other armies also were not "clean". But saying that each and every conscript soldier serving in German army was a Nazi is hyperbole. Even if you did not like Nazis, it was perfectly understandable to like their main adversary, the Soviet army, even less, and fight for your homeland.

That's just a poor article. The English Wikipedia in general is a horrible source on anything related to the Nazis.