People smart enough to do this are also smart enough to anonymise their online identity. Banning it will just push the determined further beyond the reach of the security services. Services will either become peer-to-peer (and therefore un-interceptible) or use servers hosted in countries where our governments have no sway. The politicians want the playground to be supervised, but they're going to wind up with no-one in it.

Rather than the dragnet approach favoured by the NSA and an increasing number of politicians, security services need to properly investigate targetted individuals. The panopticon approach is never going to work.