Corruption means a politician becoming wealthy in an inappropriate way from their position of power. Even if they were to pay taxes this is still a huge negative for society. Wherhers it's the president of Azerbaijan or Nancy Pelosi, it's should rise to the level of criminal enrichment if properly investigated.
On the flip side are people who made their money legitimately and employ legal strategies available to them to minimize their tax bill. I have a hard time moralizing this because we all do it. Be it writing off donations, using tax loss harvesting, holding on to investments just long enough to not trigger capital gains taxes, etc - we all use strategies available to us to pay no more tax that we have to. I would expect nothing else from a more wealthy person. I would be totally fine if society made moves to close loopholes but I can't blame people for leveraging loopholes that exist because we should all do that.