if a few (2%) slip through, it's better than 0 I guess. But why do they have to be in your face? Can't they just slide up on the bottom of the page and stay dow

if a few (2%) slip through, it's better than 0 I guess. But why do they have to be in your face? Can't they just slide up on the bottom of the page and stay down there so you can at least finish the sentence you're reading? I'm asking this as a general question.