[buran77]

Self-censorship is the result of thinking before speaking. The arguments which made you reach that result can vary. You can choose to self-censor whether you're right or wrong.

Nobody thinks they're wrong. So I'd make the bold claim that more often than not people who think before speaking are going to self-censor because their opinion is unpopular even if objectively correct. One right statement to the wrong crowd can "sink your ship" with some terrible consequences.

The combination between this "thinking" process and the reaction of certain groups selects in favor of the opinions held by the most belligerent group. You're more likely to self-censor when your audience will throw a brick at your head compared to when they just give you a stern response.

Anyway you can have a stupid opinion on one topic and a very sound one on another topic. You can promote equality of gender while rejecting equality of race/color. Even if you believe both are equally correct you may censor your second opinion to not have it sink your first one.