If you think about it, the loss was unlucky. Wright wouldn't have done bad in the 1st if he had normal playing time, which wouldn't have happened if it weren't for his unlucky injury.
The Red Sox's performance with the bases loaded this year proves my point about why it's good to treat clutch as a real thing - at the very least in the sense of "clutch hitter = not doing worse when pressure is on". In the game of baseball, a team doesn't win by getting more hits. A team wins by getting more hits when it counts than the other team. So if doing what actually wins ball games from an offensive standpoint has zero unique skill to it and is mostly random, then baseball feels like a gimmick. I think we can all agree that the Red Sox are at least doing something wrong this season with the bases loaded, and that it isn't only random chance that their hits are coming a lot less when they really need them. What they may need to do is what I do to hit well in the clutch in MLB video games - let the pressure increase your heart rate and cause extreme focus on the strategy of "if X pitch happens, do Y" that hitting requires, and ignore the specifics of the situation, except knowing that a flawless AB is necessary.