Communalism, which involves promoting the interests of one religious or ethnic group over others, can seriously damage social cohesion and national stability. When communities are divided along religious lines, trust between different groups erodes, leading to suspicion and hostility. This can spark conflicts, riots, and even large-scale violence, making it hard for people to live together peacefully.

Such divisions weaken the sense of national unity, as people start identifying more with their community than with the nation as a whole. The government might struggle to maintain order, and public resources often get diverted to managing conflicts instead of development. Over time, communalism can tear apart the social fabric, disrupt economic progress, and create deep-seated divisions that are hard to heal, making it a serious threat to the stability and growth of any nation.