Pretty much any material on violent crime could be an "inspiration" for the criminally minded. However, AARs, analysis, etc, are also highly useful for those of us who would much rather stop a rampage than start one.
Since active shooter and the like are often stopped by non-LEOs as often as by the SWAT team (or more often), it seems that having information out there for those wanting to learn how to defend and mitigate against attacks is pretty reasonable.
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