If you polled the committee members if they actually believed TCU was the 3rd-best team, out of 16, I bet fewer than 5 would admit to it.
But here's the bit of why people needle you on this...
The CFP committee is made up of legitimate college football "experts". People who have spent much of their adult lives as part of the sport. People whose combined decades of experience is a multiple of your lifespan. And it's set up as a committee to ensure that multiple competing voices are heard and the rankings they end up with are a consensus of the group's expertise and opinion.
You've never played nor coached college football. This isn't a criticism, but your adult life has been spent as a schoolteacher. Your expertise regarding college football is that of being an interested fan, the creator of a college football historically-based board game, and arguing with yahoos like us on the internet.
So the CFP, a group of legitimate experts, comes to the conclusion that TCU is the #3 team in the country, despite a loss. And you, a yahoo on the internet, say: "Well, I know better! They're
so obviously wrong and stupid! Why doesn't everyone listen to me?"
Which is why I say that it's all just a beauty pageant, and you're pissed off that they don't share your aesthetic taste.