Which happened to be the truth.
So, it's the "simple-minded" people who believe truth, and it's the "smart" people who believe lies.
Anakin was fed a pile of steaming BS about some mythical Sith creating life/stopping people from dying, and that the
Jedi lied to him. Palpatine was telling so bad, only a dead man would not pick up on that, yet thick-as-a-brick Anakin swallowed it all.
He was an idiot of the worst kind.
Lucas only added insult to injury in the set-up of his empire by showing Anakin/young Vader to be so dense.