Bhagavad Gita 1-40

adharmaaBibavAt kRushNa praduShyaMti kulastriyaHa

streeShu duShTaasu vaarShNEya jaayate varNasaMkaraHa || 40 ||

Oh Krishna, when Adharma prevails women in the family are corrupted. Once women are corrupted there will be destruction of Varna system.

Arjuna further says that if Adharma becomes a prominent feature then there will be no place for values in the society. It will be chaos everywhere with nobody to guide or follow dharma. This will not leave the women unaffected. They will be corrupted. Once they are corrupted there will be no value for the varna system and there will be relationships between varna resulting in the destruction of varna system. When there is no system then the future generations to come will be without any values. Dharma will be destroyed forever and only adharma will prevail. Hence Arjuna sees no point in the war.

One more interesting thing here is the Arjuna calls Krishna as Varshneya. This means the one who belongs to Vrushni dynasty. By doing so the author wants Arjuna to further enhance the effect of destruction of dynasties, clans and families to impress up on Krishna.