This is why Dooku made a shitty Sith. His underlying reasons were just, but didn’t stop to think about who he was hooking up with. He’s ultimately a tragic figure of someone who meant well and fucked it up.

Sith ethos doesn’t work like that. It’s a self-centered philosophy; you gain power for the sake of doing what you please. Palatine was never going to have Dooku as an apprentice long term.

Anakin’s reasons were selfish. His relationship with Padme was always toxic, immature, and selfish. Him wanting to save her was fundamentally selfish. It wasn’t for her sake as a person apart from Anakin. That’s exactly the kind of behavior the Sith philosophy encourages.