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He held the rank of Jedi, but the Jedi Council were jealous and didn’t give Anakin what he deserved.
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He saw visions of his wife dying and was willing to do anything to save her, yes, including killing kids. This isn’t evil; this is true love.
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After he became Vader, he found out his wife died.
Justifiable crash-out, to be honest
He was bad. Have you seen the shit he gets up to in the comics or extended universe?
But, he did redeem himself in the end and that is what matters.
No it isn’t! Not doing genocides is what matters!