My friend well said, but there are a few things i wish to add to it. Your concept of brahmins holds good only when they are not influences by christian/western culture. I know of brahmins who have come under this influence and committed sins that you have mentioned. It boils down to upbringing and to a lesser extent on the satvik food. As for others trying to emulate, Yes, we are plain jealous of brahmins and somewhere in the sub conscious mind would want to be like them. Unfortunately the professions we are in, the upbringing we have had doesnt make it easy to go on satvik diet and thus ends our dream to be like a brahmin. But the dream to become persists and when this dream doesnt get realised, it leads to frustration. And the easiest way to take out this frustration is on the object of your desire, that is brahmins.