Indeed , you have spoken wisely. All of us, and the government need to be notified when a dangerous person has contact with you or has been close to you, whether that person is infected with virus like corona, or a bad idea, like opposition to the government. If someone goes to a protest, for example, the rest of us should know that this person is a threat, and it would be important if everyone could be alerted if that person tried to apply for work with your company, or their children wanted to play with your children.
The government needs to track all of us for whatever threats they think we might pose, but under this program you should be able to customize your alerts so you can be notified as to the type of people you think pose the greatest danger to you, your community, etc. Maybe if someone drives in your neighborhood who has a criminal record, an alert would go off in everyone's house, or if they are a gun owner, etc.
China thinks they are ahead of us to track their citizens, but we shall use our great technology to overcome their lead in this area. Finally, we will be able to identify, track and isolate those people who are threats to others.
*Also, it's going to be important to be able to send in alerts to the government if you identify anyone you think may be a threat. What if you see someone who is coughing and maybe hasn't reported their status to the government? Or they recently moved into your neighborhood and look suspicious, the government should follow up and check them out.