Ok but to balance it: it forces you to confront your own on the topic as well.
That would force you to selectively use it since often times reality is somewhere between our personal view of it and other opposing views.
Chose the wrong situation and you'll both be crying in the corner with shatter worlds. Chose the ones where the people are truly disconnected from reality and perhaps you'll change their lives - hopefully for the better.
Nah, I say that's part of the superpower. After using it a bunch, the weilder will have little or no more cognitive dissonance of their own. Every time they use it will further purify their own thought process.
That's like a superpower where every time you use it it replaces a little bit of your body fat with muscle. After you use it a bunch, you end up ripped.
That's not a negative, I think. It might hurt a little at first, but you'll soon have removed most of your own errors and be a better person for it. What more could we wish for?