I know this topic kind of died, but i was just reading through some old posts and this one got me thinking a little bit.
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I don't think that if it wasn't hard to learn then everyone would kill each other much easily. It's not very hard to learn how to use a gun, but people don't always live in fear of death, and you don't go around killing anyone who bothers you.
I think this is a pretty logical train of though for this issue, but it has me thinking hard...Yes, it is easy to use a gun, and people do not constantly live in fear of being shot and killed. However, the main difference here is that EVERYONE in the wizarding world has a wand. If it is accepted that pretty much all well trained wizards over the age of 15 can pull off an AK given the right circumstances this is a pretty scary thought. Think if everyone walked around with a gun all the time; I know i would be much more scared of being shot. Im not saying no one walks around with guns, but by no means is it normal for people to just have a pistol on them at all times. However, if any trained wizard could do the AK then it would be like everyone in the wizarding community was walking around with a gun all the time. Now, it is a moral issue, and killing someone is not something many people can do without remorse, but if every 17-20 year old could do AK think of the problems that would occur. Sally catches her high school boyfriend cheating on her and in her anger she blasts him with Avada Kedavra, or two friends get into a heated argument and without thinking one Aks the other. These are things that are likely to happen if the AK was not a difficult spell. Im not saying it would happen a lot, but I can almost guarantee that if everyone was walking around with a gun all the time the murder rate would be off the charts compared to what it is now, and if AK isnt an extremely difficult spell than that is essentially the same thing as giving everyone a gun.
To sum it all up I dont think using Avada Kedavra is as easy as using a gun. You probably have to have a large amount of evil inside of you, and you have to really enjoy seeing other people suffer. Using AK may even tear your soul apart....And before you say that Snape used it and he was not evil I will say this; Snape may have been brave and loyal to DD, but he was enthralled by the Dark Arts. He may have loved DD and Lily, but the majority of him was in love with the Dark Arts. Do not forget that he was a DE at one point, and was definitely capable of performing an AK (he may have done it before). He had plenty of evil in his heart to perform the curse, and he also was very focused and could easily train himself to muster up the hatred needed to do it, even on Dumbledore.