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Gaara feels the need to kill because of the shukaku so i'll have to go with number two.

When gaara kills, all he is doing is reflecting the behavoir the he was shown when he was a child onto the ones surrounding him. If he had been shown something other than fear and hate when he was a kid then he wouldn't be so screwed up now. I think that he is innocent and the ones around are him just as innocent, even though they were total asses towards him. But thats the way humans are, we are conquered by our fears and fear the unknown and unexplaind. and that which we fear naturally we seek to destroy it, with no pity or grief.
wolves, shadowy, mysterious and strong. but alive and able to feel pain. They are alive just like us but we kill them, we say that their just animals. but so are we. Some think gaara is evil for killing humans because they feel and have families. But so do wolves and we kill them, so, with that logic, wouldn't that make us evil aswell?