A quick word on why it is never useless to go to a demo.
You are a thinking individual. If you agree with everything, you are not. Why?
Situations or decisions you do not agree with occur naturally if you pursue your own free thoughts. You have the right to voice dissent. Make use of it! If they say “You do not have the right” do it anyway – especially then. The more people dissent, the more people are taking notice. Even if a demo might not haven an “instant effect”, i.e. the WTO members go home weeping, the issue still draws attention. It is being perceived by the media and thus, by the world.
Therefore, change is possible. Demonstrations always have an effect, whatever the odds may be.