When there is a spree killer on the loose in your locale, then I think soem fear is understandable. What I don't understand are reactions to that fear that would tend to isolate people and might create a situation where the killer is on the loose for a longer time and may, thereby, have more opportunities to kill.

We, our ears, our eyes, are often the best security that can be provided to our neighbrohoods, imo. People hidden in their homes are not out looking out for their neighbors and neighborhoods. If that is happening in your neighborhood, then your neighbors are not looking out for you.

While the summer school classes and Little League games may not put someone into a more vulnerable spot going home, putting everyone inside and hiding is unlikely, imo, to make the community more safe. If you cancel all the activities, you are going to tend to have people sitting at home with their TVs on and not out and about in their neighborhoods.

If you want to hunt someone down and catch them, having more people out looking for them is probably not going to hurt your chances of catching them.