Moves illegal activity in harder to monitor areas. Those partaking in planning illegal activity will not continue to do so if hiding their identities is not possible. Instead, they will return to using more private means of communication, such as meeting in person, or using any online services that do guarantee anonymity such as TOR. While this may make planning illegal activity more difficult, it also makes it more difficult for law enforcement officials to monitor this behaviour, and come anywhere near stopping it: at least under the status quo they have some idea of where and how it is happening, and can use that as a starting point. Forcing criminals further underground may not be desirable. The authorities in cooperation with websites are usually able to find out who users are despite the veil of anonymity for example in the UK the police have arrested people for rape threats made against a campaigner for there to be a woman on UK banknotes.1  1 Masters, Sam, 'Twitter threats: Man arrested over rape-threat tweets against campaigner Caroline Criado-Perez', The Independent, 28, July, 2013,