If the government is corrupt, I interpret that as they're there for money and power(often in the form of how to spend the money), why is it is easier to get rid

If the government is corrupt, I interpret that as they're there for money and power(often in the form of how to spend the money), why is it is easier to get rid of the reason to be in a corrupt government than to change some of the members of said government? Feels like it'd be of comparable difficulty.