[LorenPechtel]

There is also the problem that the military tends to go for the best. In some cases that's a good idea (the cost of getting that laser-guided bomb to the release point is well above the cost of the bomb), but when dealing with unmanned units the zerg approach is very often the winner.

Look at Iron Dome. By comparison to other modern SAMs it's abysmal. But that's by design, Israel wasn't looking for a good SAM. They were looking for the cheapest SAM that could hit a sitting duck. But that's what it's facing--ballistic inbounds that have no countermeasures and no ability to evade.