Most seasons of “The Bachelor” end with an engagement. Most of those relationships end up being a train wreck. How can these couples be so sure they’re in love, and be so wrong? Simple: When we feel really frightened and our bodies are revved up, we can easily mistake our feelings for love. All the show has to do is set up scary dates (If a woman’s afraid of heights, expect her to be taken up high somewhere!), a sense of constant uncertainty (Will I get the next date?), and keep the drama going. Almost anyone in that kind of situation will decide she’s “falling for” the guy, which is a much happier explanation than, “Wow, this show is doing a lot of messed up stuff to keep me feeling extremely scared and unbalanced!” Hit show made. Disastrous engagements accomplished. That’s “The Bachelor,” in a nutshell.