From a theoretical viewpoint, the consequences of social capital for norms of citizenship are usually perceived as benign. However, empirical evidence indicates that its impact may be detrimental. To investigate this phenomenon further, this article examines the specific nature of the relationships among social involvement, social trust, and four different types of norms of citizenship. Social capital acts on these norms in two different ways. First, it varies with the specific norms of citizenship. Second, the different components of social capital do not necessarily exert similar effects. In this article, the negative and significant relationships between social trust and norms of social order are revealed, indicating the “dark sides” of social capital. This finding challenges the common wisdom about the positive interrelationship between social capital and a citizenry’s public spiritedness in a democratic state.