You don't need anonymity to speak freely. You might need anonymity to protect yourself from loss of freedom, property, or life.
For example, in the 1770s some people wrote pamphlets criticizing a man named George, publishing them under pseudonyms to protect their lives. Others signed a declaration of independence with their given names, risking death. To each his own.
Such risks may not be an imminent danger where you live right now. Nevertheless, Craig Mundie's proposal will make it far easier for armed men to track down people who disagree with them. That is, of course, the whole point of the proposal.
For example, in the 1770s some people wrote pamphlets criticizing a man named George, publishing them under pseudonyms to protect their lives. Others signed a declaration of independence with their given names, risking death. To each his own.
Such risks may not be an imminent danger where you live right now. Nevertheless, Craig Mundie's proposal will make it far easier for armed men to track down people who disagree with them. That is, of course, the whole point of the proposal.