Dunn doesn't lead the NL in GIDP, like Zimmerman does.
what do you want RZ to do? hit the ball softer?
He hits into a crap ton of DPs because he drills the ball hard right at infielders. That ball could have just as easily sneaked through the hole between SS and 3B or down the line.
Dunn was hacking at pitches over his head anyways so it didn't matter.