>people get radicalized slowly - you start with the softer sound bites, the ones where they have a lot more wiggle room to claim you don't mean this other thing. And as people start to agree with that idea, you move in with one that pushes the boundaries a bit farther. Keep repeating this process, and someone ends up embedded in the extreme forms of hate.
Why does this happen in one direction but not the other? A radical sees something slightly less hardcore. Is influenced. Sees more non-hateful content. Slowly moves away from radicalism and towards the center. Why doesn't that happen equally as the other way around? Should be a balance there, right?
Really, your whole point is essentially stating that these ideas that you hate are more convincing than the ideas you believe in. You don't think you can consistently win the war of ideas via argumentation so, since you obviously are right and your ideas are best, that justifies using power to simply suppress other people's thoughts and words.
All of this rests on your 100% certainty of being correct. Once you admit any level of uncertainty, which you must, your whole approach collapses.
Why do you get to do it to them, but they don't get to do it to you? It's because you think you're 100% right. Of course they think the same about themselves, though, so you're claiming you have some special moral position in the universe that they don't. you stand above them; you have the right to judgment on them but they don't have the right to judgment on you.
Nothing justifies that. The only real differential is that you have the power to silence them and they don't have the power to silence you, and so you're going to use that power and screw equal rights.
>something that you know is harmful and dangerous to human lives
You keep saying these things as though they're absolute facts. They're not facts. That's your opinion. Others' opinion is the opposite - to them all of your beliefs are harmful and dangerous to human lives. And you're walled yourself in so you don't understand the reasoning, and end up thinking it's just inchoate meaningless 'hate' that you're opposed to. You're ignorant of ideas outside your filter bubble, and use the strawman images of opposition you've invented to justify enforcing that filter bubble on others using power.