mod_secur ity is a patch to make
it OK to run code that has holes in it.
And it seems to me that it ends up causing more problems than it is worth. But perhaps that is only to me.
When you add a post that has anything that it is worried may cause security problems. The one that hit me first was the use of a particular full path. The path I wished to use was [slash] etc [slash] hosts, as I was creating an instructional that dealt with modifying that file. However, it would not work. After chasing down error after error I finally got it back to that, changed what I wrote, and it worked easily.
I write a typically technically-oriented blog, and I need to be able to post things like this. And honestly, I expect that my readers may post technically-oriented answers that would suffer from this. I may have to live with this for now, but it also may mean that I choose to move my blog to another hosting company because of this limitation.