When a government detains someone who is very clearly not a terrorist for nine hours without access to an attorney under a terrorism statute, that government has proven every point Greenwald wanted to make. The argument is over right there.
And every “progressive” with a beef against Greenwald who attempts to defend the UK’s actions does nothing more than prove Greenwald’s point. Governments that detain civil libertarian bloggers and journalists as terrorists deserve every heaping of scorn they get, as do those who defend them.