Greenpeace did that lots of times. They usually went straight to the roof of the company building and unrolled a large sign with their protest text ("{companyna

Greenpeace did that lots of times. They usually went straight to the roof of the company building and unrolled a large sign with their protest text ("{companyname} polutes {someplace} with {somesubstance}" etc. The beginnings of protests try to call attention for a cause. It gets media attention and people notice it. Now people know and can actually support the cause. If it can get a majority, the initial "illegal action" changed the law by forcing the government to react to what people actuallt want. That's the essence of democracy: to make the government do what the people want and not the other way around. I am really surprised (not positively) that this sparked a big discussion.