it is perfectly legal to advocate for violent revolution

Brandenburg v. Ohio, 395 U.S. 444 (1969), was a landmark United States Supreme Court case, interpreting the First Amendment to the U.S. Constitution. ... Specifically, the Court struck down Ohio's criminal syndicalism statute, because that statute broadly prohibited the mere advocacy of violence. as long as it is not an immenent threat theoretical advocacy of violence even to the government? is perfectly legal, and we need to prepare, it is long past due

If it isn't against the law.

It just so happens almost any developed country has laws against violence.

A better argument would be:

It is justified and moral to start a revolution.

You say you want a revolution?

Well you know, we all want to change the world.