i agree with you THAAD and PAC_3 are powerful systems and they can intercept our missiles but the point is they can not do that because Iran arsenal is very big and they will overwhelm any system that is near Iran and interceptors are very expensive for every missile of that systems that USA use Iran can make up to ~4 ballistic missile and if one of there warheads goes throw which certainly at least 1 goes, they can kiss that system good bye. and it will get harder when Iranian missiles carry 3 maneuverable warheads and they are coming at hypersonic speeds and from different trajectories.