I guess who forget to watch the video. Your troll explanation is not convincing. Especially for an idiot who compare DF-41 ICBM to home made palestine home made pipe rocket.Mach 24 when outside the atmosphere. Within the atmosphere the warheads are drastically slower. Interception of ballistic missiles is possible, basically at all stages, depending on the location of launch.
Decoy detecting methods exist.
Arrow 3, Arrow 4, GMD and other laser/satellite based systems already exist/soon will exist.
In a nuclear war, if there's a way to win one, the side with the better air defenses will win. This side is the west.