Just like the Tramecksans and the Slamecksans are fighting over wearing high vs. low heels, Lilliput and Blefuscu are fighting over the right way of breaking eggs. Furthermore, it's an old conflict, which started when the Emperor's great-grandfather was alive. Swift makes these things causes of conflicts because he wants the reader to infer that politics is far too often brought down to petty trinkets which are not even worth considering. Even more, wars are being fought in the name of such conflicts. Of course, there is more to it than meets the eye: wars are the way to acquire material goods. But the common people still believe this nonsense, letting themselves be fooled.
