John Podheretz, tweeting about Wayne LaPierre's proposal to put armed guards in every American school:
The awful part of what LaPierre just did is until he spoke there was nothing uncontroversial about having security at schools
— John Podhoretz (@jpodhoretz) December 21, 2012
When he wrote "… there was nothing uncontroversial about …", he clearly meant "… there was nothing controversial about …"
Where did the extra un- come from? A blend of "uncontroversial" and "nothing controversial"? A bit of emphatic overnegation? Both?
Anyhow, JPod isn't the first person to use "nothing uncontroversial" to mean "nothing controversial".
Rafael Núñez, "Creating mathematical inﬁnities: Metaphor, blending, and the beauty of transﬁnite cardinals", Journal of Pragmatics 2005:
There is nothing uncontroversial about these everyday notions, to the point that we totally take them for granted. In fact, decades ago, the Swiss psychologist Jean Piaget described in detail how these fundamental notions get organized quite early in children’s cognitive development without explicit goal-oriented education.
Rafaez Núñez, "Enacting Infinity: Bringing Transfinite Cardinals Into Being", in John Robert Stewart et al., Eds., Enaction: Toward a New Paradigm for Cognitive Science, 2010:
"Re: Cosmic radiation does cause dead pixels", Digital Photography Review 7/6/2011:
Nothing uncontroversial there. It stands to reason that a larger surface area means more absorbed radiation.
Massimiliano Amarante et al., "Contracting for Innovation under Ambiguity", Center on Capitalism and Society 2012:
While (ex ante) different agents might have different views (i.e., different probability distributions), the information conveyed by the market eventually leads them to entertain the same view: at an economy's equilibrium no two agents are willing to bet against each other about the uncertainty's resolution. Thus, in classical theories, there is nothing uncontroversial about the way one deals with uncertainty.
Update — It's worth noting that several other phrases with a similar number of negatives do not show any similar tendency towards misnegations: "not uncontroversial", "not at all uncontroversial", "never uncontroversial", … Why this difference? Is it because these are all (modified) modifiers, while "nothing uncontroversial" is post-modified noun phrase?
[Tip of the hat to Ian Preston]