Of course rational argument should be the starting point, and if you kept up, there have been and still are plenty of efforts to discuss. But, in the words of Karl Popper, who watched fascism overwhelm all reason:

But we should claim the right to suppress them if necessary even by force; for it may easily turn out that they are not prepared to meet us on the level of rational argument, but begin by denouncing all argument; they may forbid their followers to listen to rational argument, because it is deceptive, and teach them to answer arguments by the use of their fists or pistols.

That’s where we’re at now: When the intolerant refuse to play by the same rules of rational argumentation, no rational argument can hope to change their mind.