And polio vaccines don’t cut into the rate of polio cases.
(OK, even tin foil finds something every now and then, but it also makes nice shiny distracting objects.)
I frankly don’t know about heat seeking missiles, would they necessarily deliver their payload right at the thing that they homed in on? Don’t they detonate some small distance from it?
They detonate at a distance of one cubit.
The Navy uses a common cubit of six hands, but the Air Force uses the Royal Cubit of seven hands. Before translation code was embedded into missile ROMs, this difference caused many a tragedy.