There seems to be a common misunderstanding of what protest rights you have in the US. The first amendment does not give you the right to protest anything, at any point, in any manner that you want. In fact, the government has a duty to protect my rights if your protest in infringing on them. The Occupy movement is another group that completely failed to understand that fact. You are legally allowed to protest, but preventing someone from going to work or class is a quick way to get your protest shutdown. I don't think it is unreasonable to extend that same logic to DDoS attacks.