Alright, I was a bit unfair. I don't know you, good on you for standing up for what you believe.
I agree with some of your points, like this one: "By only voicing your dissent anonymously you are reinforcing the frame of the censor, validating his contention that no decent person would hold your view."
You're right, but there is a massive power imbalance. Everyone who speaks is made an example of. It's just not possible to speak freely and without fear when your livelihood and safety are threatened over it. Most of us cannot afford it.
Knowing who you are is an implicit threat that the system holds against you. It's not a coincidence that all major social media platforms are cracking down on anonymous accounts.
So I disagree that anonymous speech should be discouraged. On the contrary, I think we need to re-normalize it. By doing so, we normalize the idea that it's ok to share your opinion without having to fear for your life.