For example, my decision whether to take an umbrella today must be based on my honest best guess whether it'll rain today (and the relative utilities of various outcomes). If I shift my best guess one inch away from what's warranted by evidence, to obey social pressure or something, then acting-as-if the new belief was true will predictably lead to lower expected utility for me. That holds always, no matter how controversial the belief.
When social pressure is weak, it mostly makes people lie about their beliefs, while still acting-as-if their best guess was true. When social pressure gets strong, people start acting-as-if false things were true, and get lower utility. No amount of pressure can change the fact that actions based on accurate beliefs lead to higher expected utility. That's why I'm not a fan of social pressure on beliefs. For both individuals and societies, the best consequences are achieved by believing what is true.