Actually, to expose the lies.
When Catholics feel someone says something about Catholicism that's untrue, they're all over people like white on rice.
We're constantly regaled with accusations of *hater*, *anti-Catholic basher*, bigot, heretic, etc.
I'm not going to sit by and let misrepresentations of non-Catholics stand either.
If the lies aren't countered, then people who don't know any better will believe them.
True.