Hi, Daniel, this is a really important question! If you look at the issue from a Law of Attraction standpoint, protesting only adds energy to what you don't want, so it is a perfect example of "what you resist, persists".
On the other hand, if you feel helpless or victimized, then protesting will still feel a lot better than sitting around and feeling powerless.
So, my answer would be, it depends on where you are in any moment. If protesting feels like a breath of fresh air, then do it for the time being, but don't make a career out of it. As soon as you feel better, you should change directions and instead of protesting (which is in itself most of the time a futile effort) rather work on finding good solutions for any given problem.