Petition ask White House to allow DDoS attacks as form of Protest
venturebeat.com
venturebeat.com
Try lining up outside your local Walmart forming a human chain that prevents customers for entering or leaving. You'll end up taking a ride in the back of a police cruiser.
Sure, if it's opt-in. Most DDOS attacks come from botnets controlled by only a few people and although sometimes they are used for protests or other good reasons, it's simply too much power for one person to have.
Perhaps a website that allows people to 'join the protest' using something like JSLOIC would be morally okay, as it would only have an effect if enough people joined in. Really don't see this passing, though!
Example of JSLOIC: http://cisko.fr/