Gilchrist walked in the World Cup, is that unsporting?
And check your facts.
That incident did sort of happen but it actually happened like this:
New Zealand were playing Australia and needed 6 runs to win of the last ball, Ian Chappel was captaining Australia, and his brother Trevor was bowling. Ian instructed Trevor to bowl under arm, along the floor. When a bowler swtiches to under arm, or round the wicket, or bowling hand, he has to inform the umpire. Trevor did this and the umpire told the batsman, as are the laws of the game. Trevor rolled the balll along the pitch, the batsman threw his bat down the pitch in disgust. The incicent was even discussed in parliment in both Australia and New Zealand, and several former and (at the time) current Australain players criticised Chappel for unsporting behavior.