Why is Bangalore police so corrupt?

I had a terrible experience with Thalaghattapura PS. They need money to listen to you, ₹500 to register complaint, ₹1k to move out of their seats, ₹10k to do the right thing (that is, have a word with the person harassing me), and I don't know what they will demand to do the wrong thing. Is the situation similar with the rest of Bangalore police?