The Marriott Hotel blast in the capital is a telling story of complete failure of the security system of our country. It happened in the area having the highest security alert levels because of the presence of most numbers of foreigners in this hotel and virtually all top institutions of Islamabad establishment being in its vicinity. If we continued to remain silent spectators to acts like this, as we are now, we will be destroyed as a nation. We have to wake up and expose to the whole world the people responsible for this damnable act. -SUMBUL HAIDER, Karachi, via e-mail, September 21.