The “real beast” in Revelation was Nero.
For example:
Nero came home late, his wife, six months pregnant, asked him where he had been, he became enraged and kicked her to death. The next morning, he felt remorse for her (she was beautiful) so he ordered a look-a-like to be found. A teenage male was found that looked amazingly like his wife, so he had him castrated and he married him.
That was one of his milder episodes.
Well, he was certainly freaky and likely insane, but he did not murder millions. At least he didn’t eat his new found castrated man wife like Jeffrey Dahlmer would have.