TheBoost said:But his perfectly rational reason is almost instantly twisted, so that he kills her. It makes perfect sense. Anakin thinks he can do it, but he's wrong.
Luke couldn't give into his hatred, even if it meant that was the way he could stop Vader and Empy. If he did, his noble intentions would have been twisted and corrupted. Luke cant say "I'm just gonna tap me some Dark Side to take out Palpy, then I'll be good again." It sounds rational but it would fail, that's what Anakin tried.
(are we talking about Anakin's motivation's being incorrect in-universe? If we are we apparently agree. If we're talking about Anakin's motivations being a plot-hole as suggested by the cartoon you posted, those motivations and their consequences seem perfectly consistent to me.)
No I agree it's not a plothole. In capable hands it could have worked as his initial rationale, so long as other temptations were presented to him along the way. As it is, it's just badly executed and unconvincing.
I only posted that cartoon for laughs. Here's some others:
