HONG KONG—Hong Kong’s Secretary for Home Affairs resigned on Monday weeks after attending the birthday party of a delegate to the Chinese regime’s rubber-stamp legislature, where two of some 200 guests tested positive for COVID-19. Caspar Tsui was among 15 officials who went to the 53rd birthday of Witman Hung, a city delegate to the Chinese regime’s rubber-stamp legislature, before new COVID-19 restrictions came into force, but after Hong Kong leader Carrie Lam appealed to people to avoid big gatherings. Tsui “brought the Hong Kong government into disrepute” and “did not meet the expectations of the general public,” Lam told a news conference. “I accepted his resignation,” she said. Hong Kong has followed China with a zero-COVID policy despite the economic costs and a rising psychological toll on many people of the tough restrictions. Tsui said in a statement he had made a wrong decision to attend the banquet on …