Tobirama Senju stated that hatred births the Sharingan and strengthens it:
Can an Uchiha remain powerful without hatred? If not, does this imply that Itachi was full of hatred?
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1See - meta.anime.stackexchange.com/questions/317/… – iKlsR May 24 '13 at 1:49
Itachi didn't seem like that hateful of a person, and he was very powerful.
answered May 24 '13 at 15:03
Sam I am says Reinstate MonicaSam I am says Reinstate Monica
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1@iOraelosi ah, well, than it seems as though you've answered your own question then. – Sam I am says Reinstate Monica May 24 '13 at 16:32
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I don't think hatred is the only feeling that makes an Uchiha powerful, since many strong feelings (e.g. pain) can strengthen him, and this is just a quicker way to gain more power.
If an Uchiha sees their close friend or relative die, they gain Mangekyou Sharingan, but the feeling of hatred is not a necessity (Itachi hated no one when he saw Shisui commiting suicide).
So, I believe the feeling of hatred CAN make an Uchiha powerful, but it's not the power source. In short, a strong feeling is just a trigger, and once you awaken the Mangekyou Sahringan with it, you remain powerful.
