I think it is silly to suggest that Scotland intentionally lost by a given margin, they played, they played badly and yes the scoreline was a surprise given some of the other performances they have put in. But it was the last game of the tournament, they looked tired, they had a few players out injured and they were still very evidently trying to score right down to the wire.
I’m speaking as someone who was cheering England on, had they done enough to win every game then they wouldn’t even be in a position to complain that other scores lines cost them a championship, simple as that.