Bullet for bullets

Palestinian police broke into parliament building in Gaza City to protest lack of bullets:

More than three dozen Palestinian police officers broke into the parliament building in Gaza City on Monday, firing in the air to protest a lack of bullets and equipment in what they said was a humiliating confrontation with Hamas

Firing into the air, effectively wasting the precious bullets that they were storming a building over. Can someone explain to me the logic of wasting bullets to protest your lack of bullets.