I know my argument doesn't make any sense to you (and others that hold your point of view) because you hold the position that D1 college football is "different". It isn't. It's a team sport. And every other team sport and, for that matter, every other level of football (including all the other divisions at the college level) runs into this situation all the time.
And the BCS IS a playoff just like the NFL. It's just a 1-game playoff where all the D1 teams are playing for 2 spots instead of each conference playing for 6 spots. I know it's ridiculous to put it in those terms but that's because the BCS itself is ridiculous.
But above and beyond any of these arguments, what is the alternative? I know the public doesn't generally like rematches but that's not a good enough reason if your system is supposed to be objective. Can you honestly tell me after watching the other BCS games that any of those teams are better than Alabama? I certainly don't think so. I think that these are clearly the two best teams in the country and since you can't just crown LSU the champ without playing a game this is the matchup that was the most logical within this broken system.
24 hours from now, I don't think any of this will matter. LSU showed that they were better in Tuscaloosa and I think they will show it again tomorrow night.