well everyone has a dharma...

and as many disappointed fathers already know, their sons dharma(way of life) is not always the same as their own.
the preists were the guardians of Vedik dharma, it could be looked on as very rougish, that they just let it happen..
they just let the four dharmas turn into a political tool and a social class system

but nothing against bramana in particular just a few individuals. my teachers were brahmins