Communism and Capitalism promote class warfare. Fascism promotes class collaboration. Communism and Capitalism promote internationalism. Fascism promotes nationalism. Communist and Capitalist view man as governed solely by Materialist urges. While Fascist acknowledges that man is governed by higher instincts.
Fascism is the only ideology that a man who loves his people can support.
Communism is a scourge that destroys nations. Half of Europe is still economically behind because of communism. Communists also kill creativity and free thinking without which no nation can evolve. North Corea is still in the stone age thanks to communism. Other communist countries aren't doing much better. Only China works well but that's only because they were the only ones not to apply communism to the letter.
Fascism can have awesome short term results but it can't last forever. Unlike communism, fascism promotes performance instead of obedience but no matter how good you are you can still be killed for not believing what the fascists believe. In other words you're still not free to believe what you want. Which, of course, cannot be beneficial for a nation on the long run. At some point the mindless will take over.
Capitalism isn't perfect but at least you're free to think. Which work grate. Computers, smartphones, modern healthcare, the internet, and many technologies that improved our lives could never have been born in any other type of system. When capitalism isn't working well we should focus on improving it instead of looking at alternatives that have already failed.
You’re going to have a hard time finding revolutionaries who didn’t violently persecute ideological rivals. Hell, even the Liberal revolutionaries of the eighteenth century, which helped create the current order, were violent (the Reign of Terror in France and the persecution of loyalist in America), but once they established hegemony in their countries (and eventually the entire west) a new normal was created and the violent persecutions ended. There’s no reason to believe Fascism wouldn’t have also calmed down once it to established hegemony over society.
Once totality was established who would be left to internally oppose it? Almost everyone in the country would be Fascist. Just like almost everyone in the modern west is Liberal. Sure, you’d have a few anti-fascists, but they’re numbers would be so insignificant that it wouldn’t matter.
It's not as though the modern Liberal-Capitalist west is the bastion of tolerance and free thought that it pretends to be.
In America you have the Liberal-Capitalist Democrats, the Liberal-Capitalist Republicans, and America’s largest third party, the Libertarians, who are also Liberal-Capitalist. Liberalism is so deeply entrenched in American society that illiberal thought is considered wrong or even evil.
Despite Liberalism not being as deeply entrenched in most European countries (excluding France) as it is in America, the situation isn’t much better. In Britain you have the Liberal-Capitalist Tories, the Liberal-Capitalist Lib-Dems, and Liberal-Capitalist Labor. Even UKIP is a Liberal-Capitalist party. The main parties in practical all western countries are Liberal-Capitalist.
Some Western countries, like Germany, outright ban illiberal parties and illiberal speech to protect Liberal-Capitalist hegemony.