The quota system atleast provides an helping hand in such situations. The Merit and Fair-ground based arguments are missing the central point. A BC student if scores even 65% marks against all odds (a lack of education in family and hence lack of any guidance from elders, the absence of atmosphere favourable to higher education in family, leg-pulling by UC bosses and colleagues) then that BC candidate is as good as or better than an UC candidate who has scored 90% with all the favourable conditions and guidance.
Think why reservation really exist. If upper-caste people stop practising casteism, there wont need for reservation. The real problem is not reservation the real real problem is the casteism and casteist mindset of many upper caste people. If politicians are evil then selfish upper caste group is a bigger evil indeed. Atleast the selfish politicians will facilitate some benefit to deserving needy backward caste candidates somewhere.