This sentiment is exactly the root of the problem. If "the sky started falling" at exactly the moment when governments erected police states or attained excessive powers then they would be blocked from having those powers.

Instead, these things tend to be two stage processes. In stage 1 the government attains new powers in order to further some generally positive goal. However, in stage 2 the lack of safeguards on that power leads to abuse and excess but by then it's already too late to easily roll back or block that power.

If we wait until the sky is falling then we will have waited too long. We need to ensure that personal liberties have strong protections, both offline and on. Failing to do so won't lead to immediate disaster but it will lead to making it nearly impossible to stop a disaster as it's happening.

Whether or not the sky falls when SOPA is passed is moot. The hope is that the louder we are, the better chance SOPA has of failing to pass.

It helps raise awareness and reach others who are not HN and Reddit regulars too and by extension reach others several degrees out. That's the first step in affecting change i.e. educating others and getting the word out. If you don't attempt to do this, nothing will happen. Its not a waste. A waste is exactly what you suggest, sitting idle while shit happens and you choose not to do anything simply because you feel its a "waste". That's ignorance at its best.