BSF brutality

BSF's brutality on Bangladeshi people has crossed the limit. Its members recently killed two Bangladeshis and then begged pardon. If saying 'sorry' is enough, then what is the use of law or bilateral relation?
We are pained to see such continuous brutalities by BSF even after having a 'friendly' relation with India. We have been observing that after every incident of killing, the BSF head promises that there will be no repetition of such incidents. But, after a few days, the same thing happens. Is it not a contemptible breach of trust? Is it not violation of international laws, norms of humanity, civility and good neighbourly conduct? Is there any other place in the world where such things happen?