Regardless, if you were able to hit a large artillery shell coming at you at the speed of many rifle projectiles and hit it; would you feel fine just standing there as the remaining pieces came at you at close to the original velocity?
People have a Popular Mechanix view of the effectiveness of modern defensive systems. They will never be anywhere near 80% or less effective.
Throw in the inevitable fog of war, the sailors that cannot steer out of the way of a huge cargo ship..........
Yeah, people forget that the pieces are still coming at you at supersonic speeds.