Uh, on that I must disagree: Time travel makes less sense the more you look at it. Take "Meet the Robinsons" for example. I had an epiphany after watching it again that the entire premise defeated itself. If bad guy does not grow up bad, he never steals time machine, so kid's son never has to go back in time to get dad/kid. Therefore, the movie never takes place.
However, I must admit, I do love a good Time-Travel Story, just so long as I don't look too deeply into it!
It's like oreos. Don't think about how they're made... Or leave one on the counter overnight on a piece of paper to wake up tommorow to see that the paper is nearly see-through as oil and fat has seeped out of the cookie into the paper....  Yeah...