Unlike "Security Theatre" of the TSA et al, this is a little different. Contact tracing is proven to be effective in reducing the number of infections and locat

Unlike "Security Theatre" of the TSA et al, this is a little different. Contact tracing is proven to be effective in reducing the number of infections and locating and treating infected people earlier in their infection. These apps are aids to that tracing, not a solution. They help both those that were in contact with someone who is diagnosed, by getting tested and treated earlier, they are more likely to stay healthier. But if they also quarantine themselves and are infected, they are less likely to spread the infection further. So it's a win-win.