You are right the enemy within is our biggest threat,and not only the poor immigrants,but poor everyone who is poor and originally from India.But we will be under a grand illusion to think the assasination of Prof.Puri will be a wake up call at all.If that were to be so, then after Mrs.Indira Gandhis' gunning down, Rajiv Gandhi should not have died.The problem with Indian(and that includes my own)mindset is that we pass on everything to fate.Just speak to some of the Astrologers,and ofcourse the politicians who run to get the blessings of some sage or the other at the drop of a hat,and you WILL hear about how the "moon was in the seventh house and jupiter aligns with mars",or something like that,and hence the death!!!And Osama Bin laden knows that, and the Security agencies in INDIA also believes in that.So till such time the politicians,security forces et al,shed this mindset,and tackle the terrorist problem mercilessly,without let or hindrance,India will be vulnerable.And for heavens sake,if politicians of every hue and color are given the privilege of police "bandobast" at their beck and call,let similar services be given to the likes of Prof Puri atleast, without asking.