The Copycat_effect is always a potential looming in the background.
https://copycateffect.blogspot.com/search?q=Thomas+Matthew+Crooks
https://archive.org/details/copycateffect00lore
https://www.sciencedirect.com/science/article/abs/pii/S1359178915000336
https://books.google.ca/books/about/The_Copycat_Effect.html?id=3B4lTTZE58oC&redir_esc=y
https://daily.jstor.org/psychology-copycat-crime
https://nypost.com/tag/thomas-matthew-crooks/
https://thedigitallabyrinth.blogspot.com/search?q=Thomas+Matthew+Crooks