Dear Sumit: I belonged to a very poor family born in a small village, achieved my technical education by taking loan from Govt. While working as a trainee in a factory I used to go to workers temporary huts and sometimes used to enjoy tea made from goat milk. I could not absorb the views of some senior colleagues that they are lower cast people, because I liked them as some they were my teachers. Sometime years later in Mumbai I had to stay with a family as guest who as you said belonged to “scavenging” cast group. Later on when I was bit stronger I gave employment to one in that family in the company where I was working. He has gone up to the manager level now. It is not the time which was 100 year ago, one has to choose profession according to his ability. So reservation can be for the poor people irrespective of cast color and creed that too for education.
...there should be unadulterated non-violent non-cooperation, and if the whole of India responded and unanimously offered it, I should show that, without shedding a single drop of blood, Japanese arms – or any combination of arms – can be sterilized. That involves the determination of India not to give quarter on any point whatsoever and to be ready to risk loss of several million lives. But I would consider that cost very cheap and victory won at that cost glorious. That India may not be ready to pay that price may be true. I hope it is not true, but some such price must be paid by any country that wants to retain its independence. After all, the sacrifice made by the Russians and the Chinese is enormous, and they are ready to risk all. The same could be said of the other countries also, whether aggressors or defenders. The cost is enormous. Therefore, in the non-violent technique I am asking India to risk no more than other countries are risking and which India would have to risk even if she offered armed resistance. 
The freedom struggle gives a very good example. Gandhiji, the father of the nation, started the Satyagraha at Champaran in 1917. Then after, he took years to build upon the movement, brick by brick, steadily. Mass movements were held. People from all castes and communities were mobilized. In particular, Gandhiji was careful never to engage too fast. So much so, that he suspended the Non Cooperation Movement after the Chauri Chara incident, where a violent mob burnt a police station. He realized that by being too fast, the movement would easily crumble under the weight of the powerful British. Being steady was more important than being fast, too fast. No wonder, Gandhiji was vindicated when India won the freedom at the midnight of 15th August, when the world slept and India awoke to life and freedom.