Your view that an opinion can be equated with violence is unethical, but I'm convinced a stronger historical reading would make you blush. It's a terrible and thin rationization. It's so easy to do, here are examples from right and left, with varying degrees of extremeness, quite like yours.

Not your or my opinions, but historical (if abstracted) examples:

- Your opinion that the military in this country should be replaced with an elected government is counter-revolutionary, and your poisonous ideas should be ceased before the imperialist hordes ruin our independence.

- Your opinion that our military intervention was wrong in such and such country is unpatriotic, and therefore illegal.

- Your opinion that God doesn't exist deeply offends religious people and therefore you should not say it, and people like you should be prevented from these deeply offensive opinions.

- Your opinion that drugs should be legalized is illegal because children can view it as a condoning and get hurt.

- Your opinion that this first world war is wrong is sedition, and will lead to prison time. It's harmful to this country and the war.

I hope I illustrated my point. The last was the Sedition Act, the others are more than just one incident.

I've been Left all my life and I'm deeply, deeply ashamed and nervous about the new generation's disregard of free speech and opinions that contrast their own. It's due to a lack of historical knowledge. I am convinced.