Preaching Against Legalism to Evangelize Libertines

This is really good stuff below.  It reminds me of a book I read a couple of years ago titled, "The Seduction of the Extremes" by Peter Kurowski.

It is interesting how they use the word, 'deconstruct.'   It isn't that preaching against legalism is the means by which God grants saving faith, rather, by preaching against legalism it actually deconstructs obstacles and barriers that may have been preventing the listener from hearing.  

I wonder if the same is true for evangelizing legalists?  Preach against libertine to evangelize legalists?