I'll never get tired of saying it: politicians are the same as the citizens that vote them in. In India they won't vote out corrupt politicians because the citizenry is corrupt itself.
Give the country and its democracy some credit (Indian here).
We’ve voted out charismatic leaders, we’ve voted in huge coalitions, we’ve ignored sympathy waves after political assassinations, power transfers have been uniformly peaceful since we gained independence.
If this cultural/endemic corruption at work, I think most people in most countries would prefer this to whatever oligarchy, junta, theocracy, ruler-for-life-god-on-earth-ocrasy they suffer under.
Sure, blame the corruption on the people; It certainly has nothing to do with a system based on extortion, with no incentives to perform the functions it was allegedly established for, and every incentive to extract as much revenue from the citizenry as possible without a rebellion.