"It is of the essence of militarism that under it military men learn to despise constitutions, to sneer at parliaments, and to look with contempt on civilians." — William Graham Sumner
Being a Marine, I've experienced this firsthand. Being in the military (or police force) gives men inflated egos, the idea that everyone should do exactly as you command, and the idea that civilians only posses the rights that you give them. It also leads to the idea of being above the law. Being an official murderer of the state makes you above reproach and anyone who gets killed in the cross fire is just collateral damage, too bad for them. The life of others becomes worthless, since they are just the subjects.