From an email from Paul Foster:
From my perch, there are two primary reasons the right doesn’t more passionately oppose child abuse. The first has to do with parents’ rights. The general conservative view of the child welfare system is of a group of liberal ladies who think they know better than parents and who are especially skeptical of religious parenting, especially conservative Christian parenting. (The NYT op-ed opposing home schooling was an almost-too-perfect totem in that regard.) As a result, while many on the right will say “sure, flat-out abuse is bad,” they’ll assume that “abuse” will be defined eventually to include homeschooling, imparting religious views (especially on traditional gender roles), and the like. The early 20th-century attempt to eradicate the German language and culture through the public schools is often pointed to, as is (at least among the hipper conservatives (I swear we exist!)) that one Simpsons episode where a social worker gives demerits to Marge and Homer’s household for “toilet paper hung in improper overhand fashion.”
The second reason–and this is probably true for both the right and the left–is that you can’t even think of a solution by reasoning from your political views. “Adults shouldn’t beat kids” is universally accepted, but your views on taxes or your reading of Ayn Rand or that latest anti-Pelosi meme doesn’t give you anything helpful in actually stopping adults from beating kids. Without a political solution, it tends to fall by the political wayside.
Here are my previous recent posts on related questions concerning child abuse.