I wouldn't use the term "socialist", since that involves implications for economic production modes. But I think the vast majority of people have some degree of innate collectivist impulse. I think libertarians and anarchists are incorrect in believing the default human impulse is more closer to egoism.
The mere existence of populist movements, and their tendency to rise, both in democratic and non-democratic contexts, would appear to represent a significant empirical challenge to any assumption to the contrary.