Overtime is voluntary and employees have the right to refuse. There is at least one case (SEAWUSA v Trident Steel (1986) 7 ILJ 86 (IC)) where the court held that an employer can dismiss employees who persistently and unreasonably refuse to work overtime. That is even if there is no contractual obligation to do so.
Individualistic cultures are oriented around the self, independent instead of identifying with a group mentality. They see each other as only loosely linked, and value personal goals above that of the group.
Collectivist cultures, such as those of China, Korea, and Japan, emphasize family and work group goals above individual needs or desires. Collectivism and individualism deeply pervade cultures. People simply take their culture's stance for granted. In the U.S., everything from 'self-serve' buffet tables to corporate structure to cowboy movies to payment card rules reflect the deeply ingrained individualism.