When it comes to storytelling, we humans are simple: we take what facts we know (which is, more often than not, facts we've heard from others and believe are generally accepted) and assemble a story from them -- or, more specifically, select from a stable of existing narratives and apply one to what we think the facts are.
UK is loaded with young talent, and everyone knows it. So they are gelling at the right time.
UConn is a team few outside of fans were seriously watching, and the biggest "noise" we made recently was being utterly incapable of beating Louisville, then squeaking by in the first round where many called for our defeat. We weren't *supposed* to win any of those games (very few considered we *might* have what it takes to make a deep run this year), so the narrative focuses on what the other teams did wrong to lose to an unworthy team. Since each time that is the story told, we never look as good as we are, and each game we are expected to lose, so excuses are made when we don't. Self-perpetuating cycle. So we are getting lucky and other teams are having bad games against us.
Add in our heavily defensive style of play when the media love shootouts, and it's no surprise we get this treatment.