I suggest stepping into PMs shoes for a moment and asking what youd do? Just disown him? Thats it? And that will somehow provide our country an esteem that we do not encourage terrorism? As opposed to getting the first right- ENSURE that the legal prosecution is something our nation agrees with (thus providing legal assitance- it is an upfront cost but saves the blushes of a hayware conclusion and impact on bigger moneys in India)?
Dosowning is the easier way out as many counterparts do in the MiddleEast? While Nations like US and UK bring the accused to their own country and try under their own laws. It is placing a beleif in its own legal system above that of another country.