Why should Molinari have conceded his match against Tiger if they had agreed to play all the matches, even if the Cup had already been decided? Yeah, maybe he could have given Tiger that putt, as Europe had already secured the Cup, it wasn't so important who wins that hole. But I don't think giving those putts was necesssary. And as they didn't give those putts for each other, I think Tiger showed some "I don't care" attitude after missing his putt and conceded the hole. He didn't care it it's a tie or a loss, they didn't win the Cup. And I can understand that attitude, I wouldn't blame him on that.
But don't blame Francesco, he was just doing his best, It would've been a big decision for him to throw away the chance of an outright win. As they started to play that hole, why not finish it? If Europe had conceded that hole, they should've done it right after the Cup was decided, and it should've been up to Ollie, not Francesco.