First off, slander is spoken word. It's libel if it's printed. And there's plenty of recourse in the court system once libel has been committed. But there's this concept of Prior Restraint--you can prosecute someone for saying something, but you can't legally stop them from saying it. Now, if you want to live under a government that controls the media and only allows expression that they approve of, there's a long list of countries you might find more to your liking.
I know slander is spoken. There have certainly been plenty of spoken lies about DJT over the recent years.
Claiming that there is a meaningful difference between a law that says “You can’t threaten to murder someone” and “You can threaten to murder someone, but if you do we’ll send you to prison for years” is specious.