There were and will be opposing voices also in deepest fascism.
But more broadly, totalitarism is rather the term, where the whole society is total under control of one ideology. That can be fascism, but also other ideologies steive for that.
But yes, allowing anonymous voices is one way to counter it.
looks like we're talking different fascisms.
I don't want to offend you, it is just that your phrase is like straight from "1984" (or from Russia today) - "war is peace" and the likes.