Brother kashif you are right. MQM usually does this in order to pressure the federal as well as provincial governments for give and take. In the former PPP coalition govt, Bhai log used armed tactics to get their work done. now, this time we have yet to see how Mr. Nawaz Sharrif gives them response. if he launched an operation against them, the violence in Karachi would increase manifold. But if he negotiates with them, we will again see violence but on the smaller level. in short, the mayhem and massacre will persist as long as these goons control Karachi.