I'm sorry but what logic is it you're referring to here? Is it the idea that there are fashions in corruption? If so by that logic we are probably in an era of high corruption.

Is it the idea that if I were a corrupt politician and I had equally corrupt enemies I would use my knowledge of their corruption to dirty trick them? Because ... dirty tricking them and getting them to lose all their finance at one time is not quite the same as passing a law making it difficult for everyone to get more finance from hereon out.

I'm not following exactly what logic of mine you think you've defeated with observing that there are a lot of corrupt politicians nowadays?