> There is no greater protection to vulnerable populations than transparency
This is somewhat true, but your argument has a pretty big flaw.
> When people communicate on a public platform unself consciously, they reveal themselves openly and freely
This simply isn't true. You aren't revealing that you read this content. THe authors aren't always revealing themselves. Those who don't really do themselves any harm because they tend to be well established as white supremacists already.
Richard Spencer doesn't care if someone calls him racist and evil.
This is why people take photos and plaster them online when white supremacists march. People get recognized, that's the point where they can be called out.
> Freedom of speech is a gift and a valuable tool.
These people are radicalizing young men into committing violent acts. They should be banned the same way terrorist content has been removed from other platforms.