While he spends a lot of time pecking away at the more bird-brained outliers of the urban farming movement (something hideous-sounding called "A Hipster's Guide to Farm Animals") and famous pro-slaughter-at-home types with other areas of expertise (Mark Zuckerberg), McWilliams does present some hard points: D.I.Y. slaughter by inexperienced layfolk raises the risk of animal cruelty; urban animal slaughter brings animal shrieks, unneighborly odors and potentially unwanted disease.
It's a decent read, but given the author's stance on meat in general, the piece should be taken with a big fat grain of kosher salt. A single chicken could be raised alone on 50 acres of manicured, clover-rich pasture and then delicately slaughtered with a puff of angel breath, and McWilliams probably still would take issue. Despite the author's veganista paper trail, however, we don't want to leap to any conclusions.