You're talking remote cause. Yes, BYU's exclusion was one of 1000 things that had to go right for Utah to get into the PAC 12. But it's not like BYU did that for Utah's benefit, so we should be grateful. You did it for your own benefit, and we were unintended beneficiaries.

If we accept your argument, we have to be grateful for every single one of the 1000 things that had to go right, including a bunch of stuff that was intended to harm us but ended up helping us instead. We have to be grateful to every team that started out ahead of us in 2004, but didn't go undefeated (Georgia, LSU, FSU, Miami, Texas, Michigan, OSU, WVU, Florida, KSU, Tennessee, Clemson, Virginia, Missouri, and Iowa) and the same for 2008 (Georgia, OSU, Missouri, LSU, WVU, Clemson, Auburn, Texas, Texas Tech, Wisconsin, Kansas, ASU, BYU [again?], VA Tech, Tennessee, USF, Illinois, Oregon, Wake Forest, and Pittsburgh). We have to be grateful to the BCS? For shafting us in the Fiesta Bowl against a crappy Pitt team?

No, your actions were a remote cause, not the proximate cause. Might as well be grateful to the first paramecium who crawled out of the ooze. Utah's own actions were the proximate cause.