...for one, once batters get 2 strikes on them, they're supposed to approach things a little differently and go into a defensive mode as far as protecting the plate. Of course, not all batters do this but most do.
...secondly, "wasting" pitches is somewhat subjective because some pitchers prefer to attack when ahead in the count while others tend to "nibble. But nibbling can also make the pitcher's pitch count go up quicker than it might otherwise.
...thirdly, pitchers don't always throw the ball where they intend to...if they did, there'd be no walks. Next time the Yanx play, take note of where McCann sets up with the target and how seldom the pitcher is anywhere close to hitting that target. If a batter smokes an 0-2 pitch, he simply hit a "mistake".