We will glorify war – the world's only hygiene –, militarism, patriotism , the destructive gesture of freedom-bringers, beautiful ideas worth dying for, and scorn for woman. —Filippo Tommaso Marinetti, Futurist
The Italian Futurists were staunch supporters of speed, technology, violence, and modern inventions like automobiles and aeroplanes. Porco Rosso, set in early 1930s Italy, reflects a lot of that youthful daredevilness, including more than one nod to Mussolini (spot the fasces on the side of Porco's best friend's plane) and several of Marinetti's glorified fascist/Futurist feats.
Ergo, never trust a pig.