He has to answer media questions. That's part of his job. So, he can't just "shut the eff up".
But are we pretending that Cam Newton was some smart, cerebral QB who did the right, smart thing all the time? He had a big arm and great athleticism, which covered up a lot of his other issues. But he also had scattershot accuracy. Cam Newton was a good football player for awhile, but not a great QB, if that makes sense. Plus, I find him way more annoying and conceited than I do Tua.