Why does the American media always show German soldiers as evil while showing the Japanese with honor in WW2?

Because they were the Nazi Empire. Simple as that. The Holocaust was titled and publicized by the American Media relentlessly. Jews, s, gypsies, all being relentlessly wiped off the face of the earth. No such title exists for what the Empire of the Rising Sun did to the people of Japan and American soldiers. The Japanese were brutal, and you're right, most Germans at the time would like nothing more then the stick a knife in the heart of the men who commanded the slaughter of innocents. To be honest, your specific question has many angles to be looked at from.