The argument presented in Hibbing et al. is that the liberal-conservative is universal and grounded in psychological differences in sensitivity to negative stimulus. There are observations from historical conflicts from Sparta vs Athens to Sarah Palin vs Hilary Clinton, and some psychology references which are cited as having documented but not demonstrated the liberal to conservative divide. The finding of a genetic component demonstrates political orientation is an individual difference. People differ, at least by degree if not kind in a way that some component of this is not learned or chosen which means that it is likely to be stable. This suggests that something, inherent to individuals, causes political orientation which will be stable
