This is an important point. The anonymity of Tor relies on finding safety in numbers (or rather, among numbers).
However, the bar doesn't have to be quite that high in order for Tor to be considered de-facto anonymous. There is an order of magnitude separating the resources available to a local police force and the entire DoD. Criminals guilty of capital offenses might only garner the attention of the former, whereas someone at a 'Bin Laden' level of notoriety would be chased with the near-limitless resources of a superpower's defense apparatus.
However, the bar doesn't have to be quite that high in order for Tor to be considered de-facto anonymous. There is an order of magnitude separating the resources available to a local police force and the entire DoD. Criminals guilty of capital offenses might only garner the attention of the former, whereas someone at a 'Bin Laden' level of notoriety would be chased with the near-limitless resources of a superpower's defense apparatus.