They had to do something while everyone was waiting for the ship to hit an iceberg and sink, so they came up with a romance between upper-class girl Rose and lower-class boy Jack. It wouldn't have been a bad story if they'd toned it down a little and made it somewhat realistic, but it was over the top. I also didn't think that either character was likable, so I didn't mind that they were sailing toward doom. Rooting for them to go down with the ship was what made watching the movie worthwhile.
