Political censorship that is supposed to keep current rulers in power by shielding them from criticism is categorically different from all other types of censorship.
The difference is not gradual as you suggest, because political censorship works on a meta-level. It obstructs the democratic mechanism by which all other types of censorship can be debated and ultimately lifted.
Opposing political censorship is not just another political viewpoint. It is a prerequisite to freely discussing and changing political viewpoints in the first place.