Yes we do. (/facepalm)
For a perfect example why, see Jerry Sandusky's interview.
Sandusky’s guilty though. If your goal is to get a guilty client off on a technicality then, yes, you don’t want them out there providing verbal evidence of their guilt in public. But if I’m innocent and being tried in the media, I will be pleading my case from the rooftops no matter what you guys say. It’s difficult to keep lies consistent because they’re lies, so the more you talk the more you might trip yourself up. But if you’re innocent and only want to tell the truth, I would think you have very little to be afraid of by speaking out. Not that you want to go into a hostile interview that might try to trip you up, but going on Sean Hannity is going to be fine.