LET IT BREED. Ben, Mark and Ezra have missed an important point. David Brooks is annoyed with selfish, liberal, urban hipster-parents because if procreating becomes cool, the trend will eventually take the wind out of his "new red-diaper babies" theory. After all, hipster babies grow into kindergarten scenesters (see Cobrasnake photos below) and, eventually, adult urban liberals.
Though Brooks shouldn't despair just yet. If the looks on this kid's face are any indication, it's likely that hipster spawn are at high risk for rebelling -- and becoming born-again "values voters".