Knowledge points, why were German tourists caught at the Nazi ceremony in China?

This is related to Germany's reflection on Nazi crimes in World War II and the existing strict laws. In Germany, it is a serious crime to pay tribute to Hitler or use symbols or slogans related to unconstitutional organizations such as the Nazi Party. The Nazis dragged Germany and many countries into the abyss of World War II, bringing profound disasters to Germany and the people of the world. After the war, the German government and people seriously reflected on the war responsibility, profoundly reviewed and tried to eliminate the Nazi pernicious influence, which won the understanding of people all over the world. It can be said that in German society, "de-Nazism" is very common and serious, and showing Nazis is not allowed by social morality and justice. 1992, Germany amended the public incitement law, stipulating that symbols and signs that might lead people to think of Nazism, militarism or the Third Reich cannot be used in public places. 1in may 1994, the federal parliament increased the conviction level of "incitement". According to the new law, anyone who publicly publicizes, denies or downplays the crime of Nazi massacre of Jews can be sentenced to a maximum of five years' imprisonment. According to the Anti-Nazi and Anti-Criminal Law adopted by Germany 1994 in May, it is illegal to use Nazi symbols, slogans and salutes, and to use symbols, slogans and badges with Nazi symbolic significance to publicize Nazi ideas, beautify Nazi war criminals, hang Nazi flags and shout Nazi slogans. Those who openly publicize, deny or downplay the Nazi massacre of Jews may be prosecuted for "incitement" with a maximum sentence of five years. In addition, article 130 of the German Criminal Code stipulates that anyone who publicly approves, denies or defends the atrocities and dictatorship during the Nazi Party's administration in the form of disturbing public peace will be sentenced to fixed-term imprisonment of not more than three years or fined.