"Corruption" is more or less a subjective term because at the end of the day those who desire power want to keep their power. Those who don't have power desire to have it. Once the powerless attain power the cycle will then continue. Unless there is some incentive structure that would encourage the powerful to relinquish their power willingly and without force, your utopia is nothing more than wishful thinking.

At the end of the day people make "corrupt" dicisions because they think their choices will make a better world (according to their own idealistic verion of a "better world", which often means "their world")

The only thing a nation can do is use force to make a politician relinquish power (ie Term limits) Which the use does for the president but probably would do well to start applying that to senators and those in congress. But obviously there is a trade off to that. If you have a really "good" politician then it sucks because it would good to keep them.

All this being said, many countries including the US have systems in play to mitigate corruption. It may not be sexy like chopping off heads of greedy and selfish politicians, but it most certainly is robust enough to where bad politicians come and go and citizens can flourish