The former PM's word is obviously applicable so long as there is no change in the circumstances. But what happens in the future is not something that we can be sure of in the present. What if there is a new technology that gets developed which necessitates a test? When majority of our facilities are bound by international treatises and pacts ( which ofcourse will be solely interpreted by the US) where should we go? And personally the only quality of MMS is his loyalty to Cong High command. Remember that he did not even show the minimum respect that the former PM late PV deserved on whose account he had the opportunity to be the FM and finds himself nominated as PM today. Who knows if he is letting his masters make a fortune? Why should he be so silent on the issue when he shoots his mouth of relatively simpler problems like the recent petrol price hike?