Bad Books!! Go to your room!!

In keeping with the spirit of books...
I was checking out the Accordian Guy and he pointed to a Human Events Online article listing the 10 most harmful books of the 19th and 20th Century. I've actually read 3 of the 10 and 5 of the Honorable Mentions. With no adverse side effects...
But here's the thing, I find it difficult to swallow that any of these books could be harmful. Wrong, absurd and idiotic in some cases, but not harmful.
Take a look at the list and tell me what you think.