The justification in this case and in general isn't about the person being dangerous it's justified under the auspices that they might destroy evidence. It isn

The justification in this case and in general isn't about the person being dangerous it's justified under the auspices that they might destroy evidence. It isn't obvious to me that the risk of confusing people about what is going on and causing a situation where they think they need to fight back against home invaders outweighs the 20 seconds of warning a "dangerous" person might get because the cops don't knock.