It was Lord Acton who explained why corruption-free and government are oxymorons.
"Power tends to corrupt, and absolute power corrupts absolutely. Great men are almost always bad men."
Lord Acton, in a letter to Bishop Mandell Creighton, 1887
I think most people in most countries are willing to accept that, like our current government lead by Manchurian Candidate Rudd, with Climate Change denier Abbott sitting in the wings. They're both serving somebody other than the public, but they always give us something right before the elections in the hopes it'll sway us in their favour.
In the end you pay your taxes and hope for the best. But really anyone who *wants* to be Prime Minister, Chancellor, President, Supreme Leader, what ever, is likely to be corrupt, otherwise why would they want the job?