To get away from the nationalistic mud slinging for a moment, could I just draw the attention of any who criticised Murray's crying to watch this:
It is the great Roger Federer breaking down so badly and crying when he lost to Rafa at the Australian open in 2009 that he had to stop his speech.
It is easy to see what is going on in both the Murray and Federer breakdowns. They are overwhelmed by the sympathetic support from their fans.
Surely we know what it is like when we are having a really tough time and trying to keep it together, then someone comes up and sympathises with you and finally the tears come....
Anyone remember Jana Natvotna crying on the Duchess of York's shoulder when she lost the Wimbledon final? She went on to win it the next year.
Sports people are human, except that the dedication and hard work they bring to their game off the court (have you ever seen them train, know what their schedules are, how they have to control their diet etc..) is superhuman. And then they fall at the last hurdle and they know their chance has gone for a least another year and they have to start all over again. Well, thank God they are human and not metronomes I say.
Perhaps some of those who criticise human frailty or a great player losing (not pointing at anyone on Mumsnet by the way) should get off their arses and try for themselves what these people do. That might shut them up.