Books, Part II: Dystopian Futures

I've read several books recently about future societies on Earth. Question: Why do most of them have a love triangle (one girl, two boy love interests)? Am I the only reader who likes to know from the beginning who 'gets the girl' and then enjoy how it unfolds? 

The Hunger Games series by Suzanne Collins:

I won't describe the premise of these books because they are so well known at the moment. My take: they are engrossing, and I will probably re-read them, but I still prefer Harry Potter.

The Selection series by Kiera Cass:

A future where a strict caste system dictates profession and wealth. The society has a selection process whereby the prince chooses his future wife. I'm not a huge fan of "The Bachelor" but I still enjoyed these books. The ubiquitous love triangle is more complicated here because the boy also has multiple love interests (that's fair, I guess?). 

Matched series by Ally Condie:

This series is about a future where everything is carefully controlled by the society, including who each person marries, when they die, what they eat, etc. I liked the heroine better than the girl in The Selection and the love triangle was slightly more bearable. 

Station Eleven by Emily St. John Mandel:

Finally, no love triangle, just pandemic disease and the collapse of society as we know it. A mega-flu bug wipes out most of the earth's population. The story includes scenes from before the flu and from many years after. I read this quickly because I was so curious to see what the Earth was like after society falls apart. This story is aimed at an older audience, so it does feature a bit of swearing and "mature" themes. [Discussion for another day: why do books aimed at adults (and even teens) get called "mature"? If a book stays clean, is it immature? I don't think so!]

The Giver Quartet by Lois Lowry:

I read the first book in school (the other three books hadn't been written yet at that point). Jonas seems to live in a utopia where there is no disease or poverty or discontent, but there is also no color, no love, and no real choices. The second book, Gathering Blue, is set in a different society, where people with any disability or imperfection are not allowed to live. But Kira, a girl with a limp, has an amazing talent for embroidery that saves her. The third book, Messenger, mainly follows characters from Gathering Blue as they face an insidious evil. Then the fourth book, Son, circles back to the time of The Giver and includes the characters from the other books as well. 

The Giver series was my favorite dystopian future story. Not surprising, since I tend to like kid books more than teen books.