The second or third strike capability is not problem for THAAD or Arrow-2 system main thing is accuracy to differentiate accurately between friendly air craft and cruise missiles or short/medium range missiles ,even most mature Patriot system is still under development ,basically reliability and accuracy of these defence systems under actual war conditions in not upto desired level.
Bottom line: there is no consistently reliable defense against long-range, medium and short-range missiles, cruise missiles or rockets, artillery and mortars.
Presently both india and pakistan are at same level for development of missile defence system,therefore attack is best defence will be better strategy.