We *were* campaigning against Restricted Boot 10 years ago, when it went by names like "Palladium" and "Trusted Computing". Some people argue against Secure Boot just because it smells like what those abstract technologies we fought against years ago. Some argue against it because it's a single brand for both FSF's "Secure Boot" and "Restricted Boot" concepts, and it's almost impossible to argue against one and not the other unless your target audience already knows enough of the technical details that you hardly need to argue.