So? That's my exact point. In all of your examples the righteous eventually prevailed due to their own merits, and history proved that they were on the right side.
You don't get claim victory by shutting down the debate at the beginning. You don't get to moral high ground by "proclaiming" it, you get there by engaging the opposition in debates and by fighting to change people's mind with positive examples.
MLK knew he was right, and he worked hard to convince the remaining 66% of the country by engaging with them, by changing one mind at a time.
>My point is that here you are again, in a similar situation to those, saying the exact same sorts of things the people who were wrong in those circumstances said.
That's some crazy logic fallacy. Just because you are pushing new agenda doesn't mean you are automatically correct and your opposition are literally the same as Nazis. You also automatically assume that your ideas are the "good ones" and anything that differs even slightly to your opinion is "bad ideas". How can you tell that you are not the one being sympathetic toward "bad ideas", it is after all, like you said, hard to tell right?
You know who used the same kind of logic? Literally Nazis and Communists. They automatically proclaimed their ideology as the "righteous ones" and brutally shut down any debates.
I'm of the opinion that if you have to forcefully shut down opposite views from even debating you, then your idea is not worth debating in the first place, and you are just some immature child putting himself on a moral pedestal.
I don't know how old you are, but I wish one day you get to learn that the world is not black and white, but different shades of gray. And yes, even your own opinions will change throughout time, for different reasons.