Hating the enemy makes it easier to feel willing to kill him. It also contributes to the prevalence of war crimes such as rape, torture, killing and beating of prisoners, and massacring "enemy" civilians. I therefore suggest that instilling hatred of the enemy in soldiers is not a particularly good idea, in fact. It leads to excess, brutality, and waste.

Efficiency? That is mostly achieved by good training, plus prior battle experience. I wouldn't think it has much to do with hatred of the enemy at all.

It is not necessary to hate anyone in order to be a good soldier, but if you LOVE your land and your people, then you will fight damn hard in their defence....specially when you're standing on your own soil.

It has ever been the game of ambitious and unscrupulous politicians to tell soldiers they ARE defending their own land and people when they're fighting on someone else's soil. It's usually not really true, but admittedly there have been some exceptions to that generalization. A few...

The War in Iraq is no such exception. Any young American soldier who believes he is defending America by fighting in Iraq has been sadly misled by his leaders.