The opponents of Iron dome are falling into the IDF bias for only offensive weapons. A System if effective whatever the cost will buy precious time for either the proper military or political actions. To be able to protect the civilian population buy that. The cost when you calculate the fact that you only fire if it's going to hit something are not high. Think of it from the other side, which the opponents to Reagan's. Plan never did- you are the enemy and you go to war, but your major and really only weapon may work, but on the other hand those "crafty" Israelis might knock everyone down while giving the air force or the land forces an whatsoever time they need to effectively destroy the rest. It's a no brained to invest in large numbers
ISIS claims responsibility for bombing in Baghdad suburb; death toll hits 21 (Reuters)
from the article: MESS Report / Iron Dome passes tests, but how much will it cost Israel?