I know what I protest, because I observed political tendencies since my youth thirty years ago.
It got worse than we were able to expect.
I know I protest against the loss of fundamental political control standards called 'seperation of powers'.
And I know that many people actually know what they are protesting against,
although it is a complex mix of indvidual situations and the political/financial evolutions of the last years/decades!

So I don't care f.i. whether the young people in Spain demonstrate because of fifty percent of unemployment among them,
or whether they demonstrate because they are disgusted by the irresponsible gambling of the banks.
Both is connected. And, maybe, there is the chance to re-establish functioning democracy and constitutionality.

It is the chance to point the way with like-minded people - and such chances are rare in history, so we have to grab them when they come.