The authorities object to the devices because they operate an encryptedmessage service meaning that communication from Blackberry devices cannot be monitored.
Obviously for readability reasons this original message could not have been encrypted (also Tor does not provide encryption), but it could have been anonymized as to location and that is precisely what Tor was designed for.
Instead of the comment being posted normally on Facebook, uProtect.it posts a message saying that the comment is encrypted and can be seen by clicking on a link.