Why Don't Apple Computers Have Screen Savers or Screen Locks

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They do, of course, but you'd never know it if you watch Hallmark Movies. I've noticed one of the standard tropes in Hallmark movies is when one party "discovers" information on the other party's computer that appears to show the first party has been lying to, deceiving, or cheating on the second party. Most often the discovery is some kind of business plan or letter detailing how the second party or the evil conglomerate they work for is going to tear down the old homestead and erect horribly ugly vacation condominiums for rich singles or DINKS (Double Income No Kids). The question that always comes to my mind at this moment is, why hadn't the laptop or computer gone into screen saver mode and if it contained such sensitive business information, why wasn't there a password or facial recognition needed to access the desktop? My wife, on the occasions I voice this question out loud, reminds me that the lack of screen savers and ease of access is due to literary necessititus - our term for things in a script that don't make sense but are needed to move the story along. What is your favorite (or least favorite) questionable plot device used over and over again in movies and TV shows?