the ploughman may Have heard the splash, the forsaken cry, But for him it was not an important failure; the sun shone As it had to on the white legs disappearing into the green Water; and the expensive delicate ship that must have seen Something amazing, a boy falling out of the sky, Had somewhere to get to and sailed calmly on.
This is what the Icarus is telling us, that life must go on, and people have things to do, places to go. That while some big event happened, it might not affect most people, and therefore, they ignore.