Terrorists do not care for the human rights of any common person or any VIP. they do not honour constitutionally established law and order or political system.
Anyone who do not have any regard for the freedom and rights of others gets punished by the police and law. then why the terrorists should not be dealt in the same manner as they deal with others.
What is the sense in getting the terrorists trialed as it provides them an oppaortunity to escape or to bargain with or blackmail the govt.