Why do many titles and headlines read: "Why Europe should become...", NOT "Why should Europe become..."; "How an inventor lost...", NOT "How did an inventor lose..."; "How the photocopier changed...", NOT "How did the photocopier change..."? Are such headlines correct at all?
Headline writing and editing is a special craft within the English language writing racket (field, work, vocation, activity). The phrasing is unique to headline writing, and the examples you cite are correct (first examples). News readers on radio and television (and the web) have another dialect of English in which many things that have clearly already happened are expressed as though they are happening right now. "Iowa widget makers go on strike over benefits" is the spoken headline or teaser, whereas we all know they HAVE GONE on strike. It's just a special area of the language that evidently got that way through the quest for a quick, short-hand way of getting ideas clearly across in the minimum time and space.