The thing is

• There are delusional leaders in democratic systems that build a cult of personality and market themselves as having been picked by God to lead, some even going to authoritarian lengths to cement their rule. The united states is currently one of those countries, and I think that is a far more dangerous thing to block from my country than Norway’s monarchy
• many monarchies are hereditary celebrities rather than hereditary leaders, where the position is kept around for the tourism value and they do not have (or claim to have) any right to rule over people

So when you make a comment saying that “they deserved it” about someone whose crime is being born into the spotlight, despite any good they may have done with that position, people are going to think you’re an uninformed jerk.