Sir: Is it a sin to raise voice and take stance on the rights of minorities in Pakistan? Sabeen Mahmud, who raised her voice for the rights of oppressed communities and earned respect for her public-spirited work, was inhumanly shot dead in Karachi. The tragic and outrageous assassination of Sabeen has left a bunch of questions. The government should conduct an unbiased investigation into the death of Sabeen Mahmud and punish her killers as soon as possible. IQRA ALI Islamabad