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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
This. The redemption at the end is totally not justified.
I mean, it kinda worked when Vader was a cog in the machine and his biggest crimes were cutting off a hand or semi-choking another space nazi. But after the prequels, the redemption made no sense at all.