At a time when Donald Trump threatens to annex Greenland and the Panama Canal, China is flexing its military and economic muscles, Britain is in a state of seemingly permanent political crisis, Los Angeles tragically burns, and murderous conflicts still ravage Ukraine and the Middle East, here in Australia just one issue dominates public debate this week: whether a true Australian has the right to reserve beach space by setting up an American-style beach shelter – a cabana – to stake a claim, whether or not it’s occupied.