Hector Pulido explained to police that, by biting his nephew repeatedly, he was only trying to teach his nephew that biting people is wrong. Sure, in retrospect, he may have said, it's possible that actually biting a 3-year-old multiple times, occasionally in places where a 3-year-old should not be bitten by anyone, let alone by a 40-year-old man, was not the best way to go about this, but hindsight is 20/20.
This is not a very good explanation, but given that there were Hector-Pulido-sized bite marks all over the boy's body, I guess his options were fairly limited. The usual stuff ("it was an accident," "mistakes were made," "I don't recall," you know the drill) doesn't really seem to fit.
I can recall my parents trying to teach me things by saying something like "How would you like it if someone did that to you?" -- actually, I can recall someone saying it during my last evaluation -- but none of these people ever bit me, no matter how tasty I got. Still, it probably would get the point across. Certainly Hector, as promised, has taught his nephew (as well as everyone on the Internet), that biting is wrong, if not exactly in the way he planned.
Link: AP via CBS News