The first step is always to prepare for war by making weapons and teaching young people to march, turn on command to the left and to the right, and fire their weapons at pop-up enemies.
The second step is to find a suitable enemy. This has never been difficult. Any country, any group can be turned into an enemy with the right approach. It is only a matter of perspective.
The third step is to dehumanize the enemy, the less human the better. Enemies should never have normal human feelings, such as love, compassion and sorrow. They must be made to seem stripped of such capacities and turned into grotesque and mean-spirited monsters.
The fourth step is to inspire our young people to kill the enemy. This is not hard and is best done with flags, parades and appeals to country and heroism. The young should be excited to kill. They will be killing the killers who want to kill them.
The beauty of the system is that it is perpetual. By sending out our young men and women to kill the enemy, we will be making new enemies, justifying our need to prepare for war. And as the enemy sends out their young to kill ours, they will be confirming our belief in their inhumanity.