I will attempt to prove the existence of pure evil. That is, pure evil in terms of intention.

The definition of good: That which strives to promote the health, safety, thus happiness of innocent people.

The definition of evil: That which intends to unjustifiably harm innocent people.

THese definitions do not have contradictory examples. War cannot be used, as people fighting for war are fighting for survival. They are left with no choice but to fight if they want to live. A good person would have regrets about having to kill others in combat, therefore, we can really say killing in war is not truly the intention of war, rather, it is survival. Please understand the difference.

There is no lower level of instinctual knowledge, than to know what good and evil are. Liquistically or definitionally, we do not need to understand, it is merely ingrained in the most base level of our consciousness, called instinct.

In order to learn things, we must have a base level of knowledge to begin with. Since we cannot expect a rock to learn anything, as it is inanimate and not conscious, we therefore cannot expect OURSELVES to learn anything if we do not have at least something to UNDERSTAND the lesson in question... to begin with.

Therefore, what possible lower level of knowledge can there be than the instinctual tendency to choose good over evil? And another question, why do some "people" commit evil? Is it because they are simply not conscious (IE Philosophical Zombies)? Well, there doesn't seem to be any other explanation, does there? We can also break it down better in the following:

1)Good cannot be evil. Evil cannot be good. This would contradict both of their definitions. Therefore, it cannot be done.

2)Knowledge of good prevents one from committing acts. It is impossible to consider someone a "good person" if they commit murder or rape. They committed those acts because they did NOT know what good and evil were.

3)If evil were a choice just anyone could make, the ability to commit evil would require a good person to somehow "unknow" what evil is, and why you don't do it. If this knowledge is at the base level, and we are somehow able to remove it from the person, we in turn remove the person themselves, and make them just as capable of learning as a rock.

4)Committing evil cannot be considered a "mistake", as it is deliberate as the definition of evil above states. Deliberate is the opposite of mistake.

5)Survival cannot be a reason to commit evil, as evil directly threatens the survival and well being of the offending evil-doer.

6)Mental Illness cannot be used as a reason to commit evil either, because no matter what the mental illness is, the person in question obviously does not want to cause anymore suffering to themselves than what they are already going through. If they manage to cause more suffering, it was not intentional. Of course mentally ill people may commit suicide, but that's because they want their suffering to end, not the other way around. And so if they commit an evil act, it's not because they INTENDED to cause more suffering for themselves, and since evil is NOT a mistake, we there cannot use the excuse of mental illness. Again, mentally ill people do not want to cause anymore suffering for themselves, so if someone commit an evil act, it was simply because they intended to, and was not a mistake.

Conclusion: Anyone who commits an evil act, is pure evil. They cannot be good, as they do not posess consciousness, therefore cannot ever learn what good and evil are, which is necessary in order to be considered a good person. Therefore, people who do horrible, evil, unspeakable acts, are philosophical zombies.

There you go. Have fun.