I can see how genocidal hatred might portray confidence, right?
Eva Braun and Hitler. Padme and Annie. I see it.
First (1), Anakin must really think he's important if he gets to decide who lives or dies in the desert. Second (2), he went out there all by himself and slaughtered a group of sentients who are quite skilled in war; in other words, he can get the job done.
So Anakin is the Decider. Gee who is this starting to sound like?
And third (3), he did it for his mom. Remember girls, look at how your man treats his mother for insight on how he will treat you.
... after he ignored his mom for twenty odd years, didn't even call, then let his Mum die in the desert to return at exactly the moment she carked it. I never bought Obi Ewan's line about "breaking all former attachments". Sounds a bit like priests. If the Emperor didn't shut down the Jedi Academy, then the laywers would when all the ex-Younglings sued for abuse.
To give a real world analogy, I work in criminal law. Every bad dude that comes through the court has some woman waiting for him in the audience. And it doesn't matter if it's first-degree murder or car theft. She is there supporting him in great fervor.
This is why there should be a test and licenses for breeding.
By the same token, I have a friend who is the nicest guy in the world (I'll put him against ANY of your nice guys)--he would never say the word genocide. He doesn't have a shot in the world with any girls I know.
He's going after the wrong sort of girl. In another ten years he'll work that out.