The truth is everyone see politics as a business and an area in which you can make a lot of money and that is where corruption comes in and there is nothing that can be done against it, if we check their total asset when they first came to politics and the amount of wealth they accumulated after entering politics, you will be astonished by the total asset they accumulated in the name of serving people and yet the common citizen is suffering.
Not everyone does that. It is a common refrain for the middle class that "All politicians are corrupt" because we know that we don't have it in ourselves to believe an ideal to an extent that you commit your whole life to it.
Look at politicians like the Late Mr. Manohar Parikkar, Vajpayee, even those hated for thier ideologies like Advani and Yogi Aditynath. These people atleast believe in something and actually spent their lives in pursuit of those ideals. Its too bad that I am taking exclusively BJP names. Other parties have had their fair share of non-corrupt ideologues like Pranab Mukherjee, Jairam Ramesh etc.
These are people who had much better things to do as technocrats and engineers but instead chose to devote life to politics. That does mean something i think.