Dear sirs,
Pilots are not stupid. They knew what they were doing. This was a protest by postponing a purchase of fighter jets for the Brazilian Air Force. The Air Force has tried for 16 years to acquire a new fighter to replace the old Mirages and F-5. In all these years, the federal government has postponed such a purchase. However, several planes to transport authorities were acquired. The Air Force is not an air taxi company. These pilots left to fly their Mirages now in December. Perhaps this was his last flight. So why not send a message to the government? There is a process in the Supreme Court to hear a corruption case involving former President Lula. Do you understand now why the windows were broken by the Supreme Court?
see: http://www.sfgate.com/politics/article/Brazil-s-new-president-delays-buying-fighter-jets-2687713.php