HQ2 is the most factual corner of The Internet. I told you UConn should have been favored against Illinois, after all.
Results based thinking. If you bet on roulette and win, it doesn't mean you are "good at roulette".
The handle in Vegas was balanced, so the casinos got the vig. That is the goal. So the line was spot on.
Had UConn been favored, the casinos would have done awesome, because they would have drawn more Illinois action based on a UConn minus line. But their goal is not to gamble, it's to balance the action and take the vig.