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. Similarly, widows can suffer discrimination and unpleasant comments.
BUT OBCs ARE NOT DISCRIMINATED PEOPLE, AND THEY DON'T DESERVE RESERVATIONS.