i tried to write the exact same thing, but with better sentence structures and slightly smoother transitions.
An evil action is one performed with the intention of harming another human being, be it physical harm or even psychological. People who carry out such actions know full well what the consequences will be beforehand, but do them regardless because they lack any sense of empathy. In addition to societal conduct, evil is often defined by one's personal system of morality. These beliefs can, dependent upon the person, designate nearly any object or action as being evil in nature, quite often including even the things that other belief systems view as good. During WWII, for example, the Nazi party in Germany believed they were justified in actions that the rest of the world finds horrifying(Hitler ftw!

i dont think i've been through a single week of class discussion without him, stalin, or one of that crew being mentioned at some point). Evil actions can also be described as being egotistical and destructive in nature. However, this is not always the case, as can be seen in actions which offer no direct benefit such as murder or rape(no benefit?! There definitely is...

). I believe that people do not tend towards evil actions from birth, but rather are raised in environments which promote such actions. Perhaps, for instance, the evildoer was led to that state by a traumatic experience in his childhood which caused him to lose his grip on reality. If he can not come to terms with what has happened in the past his actions in the present could easily lose importance and relation to other humans completely impossible. Evildoers are very often the way they are because of outside influences and other variables which are beyond their control. However, once they take root such systems of thought are very difficult to extricate.(never use 'in conclusion')
altogether, i think the general ideas are decent, but you lack coherence. try to add in some transition sentences to relate your ideas to one another, expand your vocabulary, and just try to make it more exciting to read all around. oh, and instil has one l btw's =D
i wish you well, good sir
p.s. you live in phoenix?!!! WHERABOUTS? im in poor man's ahwatukee