In the 50's-70's, the US tried it's hardest to censor/hide/destroy Marxism, it's ideals, and derivatives (Socialism) - yet it still exists today.
You cannot disappear ideas by silencing the individuals that believe them. Instead of trying to hide them away, the ideas need to be exposed publicly and discussed openly. If one side truly is righteous, it will prevail through open discussion and logic.
Just like in the 50's - what we have today is a weaponized notion of censorship to destroy our political enemies and those who do not think the same way we do. That's certainly not what "Good Guys" do.