Because it worked out so well for Katie Couric

Breitbart reports that after a PBS "on the air" interview with a Breitbart staffer did not go like PBS wanted to, NPR is thinking of prohibiting such interviews in favor of "contextualizing" the content. 

Good thinking, NPR.  It's not like those you interview have clued in that you tend to misquote them and put their comments out of context, and certainly they won't do what gun rights activists did to Katie Couric--record the interview so when they're misquoted and "contextualized", the real story can get out.

Nah, conservatives have only known that for about half a century.  Give it a whirl, we'll see what happens when you do that serious "contextualizing" you're thinking of.  By the way, did you know that Congress will be setting next year's NPR subsidy soon?  Nothing like a hatchet job to make sure you get that good increase in funding you've been desiring.