What does this man do that you probably don't?

A constant mystery to me is why Americans don't or can't pronounce their T's. Everyone says innanet, innaview, innastate, Atlannic, Atlanna, fannasy, authennic, inneresting, and Sanna Clause which are just some of the hundred of words with interior  T's that go unpronounced. I can accept that ordinary American might fall into this bad habit, but it's epidemic. Even television reporters and anchor persons fail to pronounce their T's. Why? Did a dictate come down from Washington or Harvard that I don't know about, telling everyone it is no longer necessary to pronounce words correctly? "Just say it the way you feel comfortable." It probably doesn't bother anyone reading this. Or maybe you haven't even noticed. But it drives me mad. You would think television personalities who make a more than a million dollars a year would spend some time and effort working on their diction. But since nobody cares, nobody bothers. And if you want to hear how nice correct diction sounds, tune into Forensic Files. Their announcer, Peter Thomas, always pronounces his T's, and it sounds great.