This is all true, to a certain extent.
But I think the bigger issue at work here is the conference protecting its brand. Conferences always shaded things a little if it meant keeping a team undefeated to make sure they got into the old 4-team playoff or BCS championship game. And if we're honest, we benefitted from that in the Big 12 once or twice (not as frequently as ou).
Now it seems like conferences will try to make sure they get 3 or even 4 teams into the expanded playoff (I haven't forgotten the 5 bad calls in the first half of the aggy game, when their only way in was to upset us and then win the CCG).
In the case of the CCG, it's as simple as this: the SEC-is-the-best-conference mystique takes a hit if Texas shows up and wins it immediately, especially given that we're only in year 2 of a return to national relevance. So, they made a business decision to fuck us. And, to your point above, everybody hates Texas anyway, so no one will mind that we're gonna violate them repeatedly. They probably won't even be able to see it, and if Texas fans say anything they'll be written off as homers, no matter how many black-and-white examples they can list.
So, in conclusion, again, fuck the SEC. We'll be the ones they're protecting probably as soon as next year. But I'd rather just have straight games.