The Sudarshan chakra of Lord Krishna allegorically represents the absolute power exercised by Lord Krishna. When justice is delivered by Lord Krishna himself then judiciary, administration even policing does not come in way. Justice is immediately delivered by Lord Krishna.
To save misery of millions of countrymen and soldiers Chanakya (the most able administrator in the entire history of mankind) got 100 kings eliminated in one night. The awaited Kalki avatar would be a deadly combination of Chanakya and a self realized soul.
During times of Kalki avatar, rapes of woman (what to say of children) would be a bygone era. Not a single rape occurring in entire country. The ruthlessness exercised by Kalki avatar would be without precedent. On the spot decision making would be forte of Kalki avatar.
The Sudarshan chakra of Krishna represents that moment port of sin is full, the judgement is delivered immediately. Same shall be the case with Kalki avatar but with a difference. Kalki avatar would not wait for any outcome by the judiciary or the administration.
The moment a sin is committed, justice would be delivered that very moment.
During times of Lord Rama justice was delivered through bows and arrows. As science advanced, bows and arrows took shape of Sudarshan chakra. Both Sudarshan chakra and bows and arrows are allegorical. They represent immediate decision making and delivery of justice, nothing more!