Not that western politicians are squeaky clean, but there's a bit of a difference between not going bankrupt and amassing billion dollar fortunes while in office.
Not going bankrupt is just a proxy that (in the absence of actual names and numbers) allows us to reason about their habits. It doesn't mean that they only still enough not to go bankrupt :-)
And then there is scale. There is only one western country where money is on a comparable scale.
In the U.S., our politicians get rich(er) after they leave office. Same for appointed government officials. Still a degree of corruption, but not as bad.
