you are also making your users angry.
Airlines train their crew for emergencies. Biggest obstacle they face are passengers. Not panic or fear. But apathy. Experience has shown that in case of a real emergency, people simply remain apathetic and even when they do react, they do with less rigor than needed.
Anger is good since it provokes people to act.
Bystanders are another example. No matter the incident, people will just stand by. To get people to react in such situation, one needs to establish physical contact with each of them. Yelling at a group of people to help you won't do anything. But go around and push each of them and a relevant majority will get engaged. A quite useful technique to keep in mind when dealing with such situations.
It also works the other way. Law enforcement is typically trained to avoid any kind of engagement. You can witness this in any of the videos from real actions. As long as people are merely talked to they don't react. The moment they get grabbed they react with excessive force, even if the contact doesn't warrant it.
Also, the only people that heard of SOPA would be those that read reddit or similar news aggregators and even only those that read relevant topics, let alone understood what it means. There has been almost zero coverage in any mainstream press. If 5 million heard of it, that's not even 1% of internet users let alone of entire population. And 5 million is a lot.