Or as my favorite social, Gevlon, says:
People have an inherent FEELING (as opposed to rationally proven/challengable opinion) about what is right or wrong.
Whenever the majority votes "wrong", a social person will consider these voters "wrong" or "evil" and feels urged to punish/change them.
Like you CAN'T accept slavery even if great majority of your country would support it, Frostheim can't accept "these kids ignored my earlier statement and did not respected me enough to care to tell me that they will go for optional bosses"
Yes, slavery is just fine as long as only a minority oppose it.