I think that the people who have responded before me have done a good job of discussing many of the possible reasons that Republicans appear evil. There is no one reason, but a number of factors contribute to their callousness regarding the poor and their apparent vindictiveness.
Religion is one of the factors. Many Republicans tend to use religion not as a tool for self improvement, but as a method of judging the actions of others. They seem to be more interested in upholding some sort of "moral order" than in advancing the welfare of others. There are a number of Protestant denominations and a strain within Catholicism (as seen by Benedict, the last pope) that promote a punitive interpretation of human behavior. If you are suffering it is because you are not holy, and thus, you deserve it.
Authoritarianism: Studies have shown that Republicans/conservatives tend to value order and authority at greater levels than progressives/Democratic voters. This could be influenced by religion, as discussed above, but the fact is that when you put your trust in authority, you are more likely to be swayed to act in ways that the authority figure deems appropriate, even if their actions conflict with personal values.
Fear: Republicans seem to be motivated by fear. I mean we are all motivated to some degree by fear, but Republicans seem to have a more negative mindset where they are seeking to allay fear with stability. These factors blend together. Fear creates discomfort which Republicans attempt to assuage by seeking out authority. Religion offers a level of authority and a code of behaviors that may simplify life and reduce anxiety.
Republicans in this mindset are subject to see people who do not share the values as "other" and as such, unworthy of those things which make life livable. They use religion to justify their punitive views and their vindictiveness.
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