One of the announcers during the game had said that Manu was given the instructions from Pop to not call a time out...but instead to just go ahead...which is what he did...
I think the bigger problem was not that TP missed those FTs, it was that he went in and tried to get fouled in the first place when there was barely any time left, knowing that he's not a high percentage FT shooter...I think in this case it would have been better for Manu to try to get fouled, since he is known for clutch FT shooting especially and is who Pop wants to shoot FT in crunch time...Plus, Manu had 31pts already...So I think he should have went in at that time, and did something, either make a shot or get fouled...
However, I still don't think TP should be blamed for this loss. In my opinion, one player cannot be the cause of a team loss, when a team losses, there are other players who didn't step up/made mistakes/etc...