I honestly,

Villains do it because villains want recognition, and sometimes killing the good guy in't enough, he has to hammer into his head that he won, that there's nothing the hero can do etc. It's almost like the psychological thrill is more important than the task.

Think of in sports, it's good to win.. but it feels WAY better to completely crush the other team. Especially because in most cases the villain has a personal vandetta against the hero. So a team that regularly beats your team, and you win, and can absolutely dominate that team, it's what you'd want to do.

The 'tell your plan and gloat' aspect of a villain isn't that unrealistic, what's normally more unrealistic is when the villain escapes and manages to stop the plan even after it's already 99% in motion.

Idk, this guy started a revolution by enticing the Trade Federation to blockade a major planet, helped raise and influence both armies against each other, became dictator of the Republic he basically declared war on, and had his major competition killed off or exiled and labeled traitors. He also blew up a planet, turned best friends against each other, and gave an order to have a bunch of children murdered.

Well, he did make one mistake.
He should have just slaughtered Simba straight after, instead of telling him to run away only to send the hyenas to fuck up the job

when I was 4 I watched that shit erry DAY
still do..

"You know, One thing I like about the bad guys is that there's always a lot of discussion before they get to pulling the trigger." ---Ulman Metro 2033 Ranger

Well, he did sing, but it was an awesome song.

*ahem*... Shakespeare.

We need more niggas like this.

"SPIDERMAN! NIGGA I KILLED YO UNCLE"
"YOU SANDY MOTHERFUCKER, I'M GONNA-"
-SPLOOSH-
Drown the nigger in sand.

what? he had a whole song about his evil plan!

www.youtube.com/watch?v=TQw5d_S0Zlc

Relevent.

Amon does that too, villains that just do their thing instead of explain it are the best type of villain, also leaves more to the imagination.

My favorite villain right here.

But then he got cocky when he had the chance to do it a second time and decided to motivate Simba by telling him he killed Mufasa all along.

Something to consider:
Lion King was based off Hamlet, Scar was based off of Hamlet's uncle who murdered Hamlet's father to become king. Uncle (Scar) then marries Hamlet's mother (Simba's mom), and she is his queen. Pretty much, while Simba is gone (Years) Scar is there banging his mom.

but he did sing and he killed his bro cause he wanted to be the king

The wolf from Little Red Riding Hood was also kind of a jackass. Come to think of it, the wolf in the Three Little Pigs was also a douchey villain.