The social and the biological are deeply interconnected and there's a point that the differentiation becomes arbitrary rather than something fundamental. Our instincts, our goals, our desire for survival, our push towards surrounding ourselves with people to feel protected, our desire to feel loved and cared for, our feeling of empathy.. all kinds of ideals, objectives and goals, everything that comes "from the heart" is deeply linked to our biology, it's not something that comes from rationality and logic, they only make sense "emotionally", and emotions are deeply rooted in evolution and our animal brain.
I honestly don't think the left is more social or less biological than the right. It's true that the right is less flexible to change, but that doesn't mean they are any more (or less) rooted in the biological than the left is.