> Can't movements as important and big as Egypt still occur without anonymity?
How is that even a question. Of course governments target people they see a potential threat. History is full of examples of movements being suppressed to protect the established seats of power.
You don't even need to go all the way to Egypt; the FBI's former program known as COINTELPRO was specifically about targeting potential leaders who speak up before they can form a larger movement.
> trolling, bullying
Have you ever actually been targeted by a person or group engaging in active trolling, bullying, or harassment? I doubt you have, because reliable anonymity is one of the only defenses against the current weapon of choice used to harass people that dare to express their opinion online: "doxing"[1]. Without anonymity, a lot more people would be subject to death threats (including their address and other specific details), calls to their neighbors or employer with slanderous accusations, swatting[2] or worse.
However, the largest problem with insisting that communication must include real names is the chilling effect it has on groups like the usual racial minorities, LGBT people, or women. The entire concept of being "in the closet" is based on the fear that comes form knowing that speaking publicly in support of civil rights might risk sever harassment or even death.
I suggest watching Vi Hart's video[3] from last year. It's difficult to watch. I'm hoping it can give you a sense sense of scale about the problems that are the daily reality of many people. Thanks to anonymous communication over the internet some of these problems are finally being discussed. People in targeted minority groups finally have a way they can communicate without risking harassment or death. Do you really want to tell them that they need to take that risk or get back in the closet?
[1] https://en.wikipedia.org/wiki/Doxing
Which isn't to say that one has to care about the faceless mob; I'm perfectly happy not interacting with pseudonymous or anonymous people outside of--well, basically HN, but the problem pseudonymity/anonymity solves in many quarters is real.
Of course there is evidence and particular pockets of great good, but internet trolling, bullying, acting inappropriately, fraud, and scamming people greatly outweighs the good. Can't movements as important and big as Egypt still occur without anonymity? After all, a lot of the people tweeted and used Facebook with their real names and information.