There has been a trend where the frequency of bad announcements being broadcasted outweighs the good message. In my point of view, I reckon that this is because such a broadcast serves as a warning to other persons who might have planned to either carry out a similar activity or plan to be in a particular location. Consequently, it helps humans to make plans to avoid any danger they foresee. Similarly, this sort of message also helps to arrange our activities for the day. Given the level of importance attached to having this knowledge, they should not be banned.