I enjoy watching people fall in love on-screen so much that I can suspend my disbelief for the contrived situations that only happen in the heightened world of romantic comedies. I simply regard romantic comedies as a sub-genre of sci-fi, in which the world created therein has different rules than my regular human world. Then I just lap it up. There is no difference between Ripley from “Alien” and any Katherine Heigl character. They’re all participating in the same level of made-up awesomeness, and I enjoy every second of it.