Why was the full-face veil ban upheld in S.A.S. v. France?

The correct answer is that the full-face veil ban in S.A.S. v. France was upheld primarily because it was argued to promote interpersonal social relations. The French government posited that the wearing of full-face veils could hinder communication between individuals and obstruct the integration of the wearer into French society. This reflects a broader societal interest in maintaining open interaction and shared values among community members. The court recognized that fostering interpersonal relations is vital for a cohesive society, which influenced the decision to uphold the ban as a measure to support social cohesion.

In contrast, considerations around national security, alignment with international law, and cultural representation were less central to the court's rationale. While national security and public order were factors at play, the emphasis was on promoting social interaction rather than addressing safety concerns. Similarly, the relationship with international law did not directly dictate the court's decision in this case, as the context of social relations was prioritized. Cultural representation is also not directly tied to the justification for the ban, as the focus was more on the implications for social dynamics within France.