The stance is myopic at best and logically erratic at worst. The dichotomy of "disease vs. social problem" really doesn't do anything toward understanding or treating addiction. Neither does banning animal research, whether wholesale or specifically in the context of addiction research. Equating animal research directly with physical disease paradigms is little more than a knee-jerk reaction to the similarly over-reactive policies promoted by the animal-rights folks. There is unquestionably a social component and ignoring this component should not be sacrificed in favor of a hard-line stance on animal model use.
On a related note, this history of opiod addiction treatment is interesting.