Let's just say that the government does just rain bombs from orbit. They are humans, there are gonna be dudes that want to get their feet on the ground to start shooting things. Regardless of the type of government, humans are creatures of destruction. People are gonna want to shoot an alien bug for a multitude of reasons. Glory, honor, to prove themselves, fascist government or not, people will be lining up around the block to sign up for an interstellar opportunity to be a 'badass'.