Cricket

Batting isn't just the skill of hitting a ball, it's also the athleticism and tactics of running. The batsman's position in relation to the crease is a fundamental concept in batting tactics. This is absolutely not a case where the batsman would generally be considered ok to absent-mindedly wander outside the crease, such as for the off-strike batsman during a bowler's run-up. There is no substance to the principle argument like with a mankad-style dismissal, just the vague suggestion that the fielding team should reasonably allow the batsman to self-determine whether the ball is live or dead.

It's really not a neutral-sounding argument. McCullum has dismissed the same way, Bairstow has attempted to dismiss the same way, yet you're holding Australia to this imaginary standard of sportsmanship which none of the involved parties can hope to live up to.