People say that we have commited crimes and suppressed the other caste.But dont forget the upper caste are not brahmins but all powerful caste whether vanniyars,jats,patils,kamma's,bhandari and host of other upper caste but just because they are numerically dominant they got themselves OBC tag.
Even today u will see that most crimes on dalits,sc/st people are commited by these upper caste people(now OBC's) but just brahmins have to suffer because they are in smaller nos.