Lately, in my trips around the blogosphere, I have noticed that often the most vehement Anti-Catholic, is the person who claims to have been a Catholic at one point. Searching the net and blogger, you will find numerous sites from someone who claims to have been "saved" from the Catholic church and now wants to just devote their free time to bashing it.
This is an interesting phenomenon, often these people will latch on to any and every anti-catholic theory or fanciful history, they will use "drive by" apologetics to try to make points that really do not exist (quoting one or two sentences out of context in order to make it appear Catholics claim to be greater than the scriptures or have a very dim view of them, most often).
I am not here to point fingers, but I can't help but notice that I cannot find blogs from former-Baptists-turned-Catholic, bashing the Baptist Church, or any other Protestant denomination. Truth stands to defend itself against falsehood, falsehood attacks truth. That is why Catholics are always on the defensive from those who would tear it down.