Answer lies in the highlighted part, it could be a basic right of every Pakistani but not at all a right of an individual who is not a Pakistani, long ago Mr. Qadri preferred to reside in Canada. Moreover you are misunderstood between a constitution and a law, to cope with terrorism you need to legislate or amend already existing laws, you absolutely don't need to cease or amend constitution for it's just a framework. To get rid of Muk-Mukka you want to finish constitution! I hope you said so being sarcastic, in west you would have been charged and sent to the prison if you had said that there, unfortunately in Pakistan every dick and harry can reprobate constitution openly. I don't see any flaw in the constitution of the state as it maintains everything a state needs, mind you it took us 26 years to build a constitution acceptable to everyone and you want to cease it and replace it with one which would take another 2 decades to formulate! Btw what will you be operating whilst; 1935 act, 1956, Layalpur ghanta ghar or Mushi's LFO?
Be the part of electoral process if you are really well-wisher of Pakistan, make it to the parliament with 2/3rd majority and legislate what indeed is needed and get rid of Muk-mukka for once and for all. No need to reenact Tehrir square, there's hell of the difference between two situations. Tehrir square was staged against something overt, but here nobody knows whom against this stage is going to set. There's no point paving way for establishment to intervene and take the charge. People like him will go back to their respective countries by next available flight as parole makes them absolutely immune, it's only we Pakistanis who would pay the price and see more destruction and chaos..