Given this from the article: Supreme Court of India upheld the constitutional validity of many harsh legislations on the ground that "Parliament is competent to enact the laws in exercise of the legislative power conferred on it."
I can't see what the big problem is, apart from some secessionists hell bent on creating mischief, no matter what the cost to the locals. Of course terrorists are going to call a legislation "harsh" if it curbs and frustrates their activities. Anyway waiting to be enlightened by someone who can shed more light on this.