In Act 1 Scene 14, while investigating about the murder of Mr. Douglas, Sherlock Holmes had to be blunt with Barker

In Act 1 Scene 14, while investigating about the murder of Mr. Douglas, Sherlock Holmes had to be blunt with Barker. Do you think, anyone has the right to exploit other people for any reason at all, not caring about their self respect or dignity? (30-40 words)