It takes little effort to find unsavory information on just about any topic. The fact that this information exists doesnt cause people to commit crimes. Does it make their job easier... sure! Just like killing a person with a gun is easier than a knife. And killing someone with a knife is easier than with a spoon. So the challenge is where do you draw the line. Was anyone directly harmed by the collection and printing of a "criminal acts - how-to manual". I think not. In the McVeigh case, I would say that the access to fertalizer and ammonia nitrate is now controlled in better ways - to prevent "access with ill intent".
Darth Fader