theoretically, you have the right to represent yourself in any manner that you choose. Be it a straight forward manner, that addresses your real identity, or though any legal
form of proxy.
Just imagine if you could no longer use any form of Avatar to represent yourself on any Internet provided service and you had
to use your Drivers License or ID photo, only! That takes away part of the alleged
freedom to express one's self, in any manner that they so choose. The beauty of the Internet is that it is a place without the standard restrictions of any one governing body. It is global and represents freedom from any oppressive and totalitarianistic type of regulation.
To have governments come in a watch everything that you do on the Internet and govern what you can and can not do, or control how you can do what you do, effectively destroys some of the basic ideals that made the Internet what it is today.
There are people out there, who must post anonymously, to get their message out there, for fear of reprisal against them or their loved ones! And that is not only within 'Oppressive' countries, but even within allegedly 'Free' countries such as the U.S.! The U.S. Government is hiding under the Patriot Act to allow it to monitor and control the use of the Internet where ever possible.
If the 'terrorists' disliked America's way of life and want it changed, then they are accomplishing that goal with the help of the Government it'self! Our way of life has indeed changed significantly
over the past decade, we now live under the guise of fear! "Mission Accomplished!" GWB!
I digress, Americans tend to be more sensitive to any personal 'rights' being taken away, a) partially because it is one of the primary things that made this country great and b) over the years there seems to be an obvious (possibly nefarious) intention to erode these individual rights, one law at a time.
This seems to be the more broad method of controlling the masses by directing their behavior into a specific direction, by threat of litigation rather than by the more traditional methods (guilt, religion/faith, peer pressure, family/moral values, tradition, etc.)
This particular proposed act is relatively small, but they do add up over time.