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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 strove for power and renown. Points 1-3 didn’t trigger him, they were excuses to become the evil he was fated to become.
He had his redemption arc but that was something like when he was in his 40s or 50s and reaching the twilight of his life, and knowing that Luke may well kill and replace him. Seeing Luke sacrifice himself instead, moved what little good (or more accurately, moral principles) was left in Anakin.
In terms of alignment, Anakin was always Lawful Evil imo. My interpretation is that he was swayed by the strength of Luke’s adherence to the light side and his almost complete sacrifice. I don’t think it was really motivated by love.