Reservations are justified only for discriminated people like Dalits, STs and Widows. Becasue they face certain social hindrances--they look down by OBCs [Dalits often say OBCs are harsher than upper caste people]. Similarly Dalits find it difficult to get private accomodation outside the campus.
BUT OBCs ARE NOT DISCRIMINATED PEOPLE, AND THEY DON'T DESERVE RESERVATIONS.