Did they just fall out of love with him?  Could it be as simple and as irrational as that?The British Labour Party’s decision to dump Keir Starmer as leader and the country’s prime minister, on even cursory analysis, defies all reason.Just over two years ago, sweeping to power with the greatest landslide victory in over a quarter of a century, would have been beyond the wildest dreams of the British Labour Party. This week, they will blithely dump on the rubbish heap of history the man who brought them that victory.According to sociobiologists, falling out of love, like falling in…