Why pick on India? Corruption abounds in many organisations including government, sport, charity, and business. Cosi fan tutti.
Corruption is pandemic worldwide. Every country, every nation, every tribe, every people, every language. No country is immune to corruption.
The same reason ANY government or organization is corrupt.
The wider the gap between the "normal" people and the "elite", the more corruption there will be. On top of that, add a class system to further separate the people, and it contributes to corruption.