Offensive truth is a valuable form of information

We can divide information into four categories: inoffensive lies, inoffensive truth, offensive lies, and offensive truth. 

• Inoffensive lies makes you a politician and low-key harms society. 
• Inoffensive truth makes you captain obvious and is annoying. Sometimes the inoffensive truth needs to be said because people don't realize it, but this is extremely rare. 
• Offensive lies make you an asshole. These are insults which are false. 
• Offensive truth actually contributes something meaningful to society. No one is allowed to say the offensive truth and so it is not widely known. Pointing out blind spots in society's understanding of itself is extremely useful to group survival and the willingness to deviate from acceptable discourse, to sacrifice oneself for the greater good of the group, is evidence of altruism.
• There is also a ratcheting effect where the more people conform the more they are expected to conform. People who deviate from this by saying the offensive truth give space for others to think and say more modest opinions. The asshole in your group who tells it like it is is doing you a favor.
• North Korea is a prime example of the most extreme conformist and domesticated society. Extreme conformity leads to the empowerment of dictatorship. 

Being offensive for offensive sake is not good. Within the human mind there's a tendency towards genetic fallacy. A genetic fallacy is when you dismiss information because of the source. Believe it or not, people who you hate, people who are even bad people, actually have true things to say. Dismissing an opinion because it is offensive is classic genetic fallacy. Among those who think that the inoffensive = the true, if you offend them with truth they think they have the right to offend you with lies because they cannot tell the difference. They do not realize that offensive truth is possible. They do not realize the outgroup might be right about something.