How to put it, it can only be said that learning more knowledge is still very useful. Intentionally seeking strangers in a bar to spread HIV cannot be said to be completely non-existent in behavior. Currently, HIV is no longer an incurable disease as it used to be. Although active treatment cannot guarantee 100% recovery, the possibility of returning to normal life and even suppressing the virus to zero is very high. It is like being infected with a cold and not actively treating it, but trying to spread the cold. Moreover, HIV is not transmitted through daily contact. Drinking alcohol together, sharing cups, hugging, kissing, touching skin, sharing toilets, and even saliva itself are not normal transmission routes of HIV. Even for HIV carriers, risks such as spitting and general bodily fluids splashing can be ignored. Even if this person intentionally spreads through unprotected sex, the efficiency is not as high as many people imagine. The CDC's single average risk estimate for "HIV positive partner, no condom, no PrEP, no effective antiviral treatment" is approximately 0.04% for vaginal intercourse with males as insertors, 0.08% for females as recipients, and 1.38% for anal intercourse recipients. To give an extreme mathematical example, suppose a contagious HIV positive woman engages in unprotected vaginal intercourse with 80 HIV negative men once in a row, and calculates the average single risk of 0.04% according to the CDC: The expected number of infections is only 0.032 people. The theoretical probability of at least one infected person appearing among 80 people is only about 3.1%. This does not mean that there will definitely be no transmission, but rather that the true transmission efficiency of HIV is not on the same order of magnitude as infecting dozens of people in one night. Another crucial factor is that many HIV infected individuals who have been diagnosed and receive standardized treatment actually do not have the ability to transmit sexually. WHO has confirmed that individuals who receive antiretroviral therapy and maintain undetectable viral load will not transmit HIV through sexual intercourse, commonly known as U=U (Undetectable=Untransmitted). So the story of "knowing that one was infected with HIV and then going to a bar to retaliate against society, and then infecting many people overnight" actually implies a series of conditions. This person not only needs to have malicious intent, but also needs to maintain virus suppression, have a high enough viral load, engage in high-risk sexual behavior with a large number of strangers that truly have transmission conditions, and these people also need to happen to be infected. In theory, it is possible for someone to intentionally spread HIV, but using such extreme cases to explain a group infection of dozens or even more than 80 people at a bar event is medically very far fetched. Just a little treatment can bring it under control. Not to mention that once HIV is detected in China, it will be reported, and after reporting, there will be a series of measures taken. Although it may not be as strict as regulation, it is not easy to retaliate against society, especially when dozens of people gather together, not only in China but also in the United States.