I think the criminals she was talking about are those who have something to do with the dirty cops who will share the confidential information, including what these softwares say. I do think that it is very difficult to breach the security of such crime predicting software, but it is not so difficult for the more notorious criminals to use cop connections in gaining the knowledge they need. With that being said, if only a very few criminals know the low surveillance areas, they would be better off commiting crimes without worrying to be caught by surveillance.