Even in the early 2000s, in the aftermath of 9/11, I can remember people in school passing around copies of The Anarchist’s Cookbook.
Perhaps I’ve been naïve, but I’ve always assumed that should one actually want to look up instructions for nearly any sort of horrible thing one could imagine, it could be found fairly quickly using nothing but a little Google-fu.
I'd be careful with TAC. They leave out some important steps in chemical synthesis. As a stupidly curious "mad scientist" growing up, I'm frequently surprised that I still have both eyes and all 10 fingers.