The same reason why we address Mughals like Akbar, Jahangir, etc. as “Badshahs” 
Alauddin Khalji as “Sultan”, 
Winston Churchill as “Sir” 
& several foot-licking zamindars as “Ray Bahadurs” 
These are titles conferred upon them by their office, not because of any public Respect. You can choose not to address them by these names, if you don't think it's right to do so… P.S. If you look for titles which were born out of public respect, you don't have to look further … Mahatma Gandhi 
Netaji Subhas Chandra Bose 
Desha bandhu Chittaranjan Das… 
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