My opinion is no. If there's tactical information they want, they will most likely be able to find it somewhere. Additional concepts and strategies can be obtained through extended resources such as specialized classes, books, etc. There is also so many variables in different rampage/shooting situations that there is not "one" infinitely valuable piece of information that keeps the perp from getting caught or getting equalized by the police.
"Vegetarian, an old Indian word for bad hunter."