Solution Of Corruption
This leads to chaos. It is the duty of the law enforcement agencies and the judicial courts to bring a criminal to book. Common people are prone to propaganda, they have no means to investigate a crime if it is really committed. If every person or an institution is free to eliminate the people he thinks are corrupt, this will lead to anarchy. And Anarchy is the Fasaad the great fitna. So you are suggesting the greater fitna for a smaller fitna, which is not proven for every individual accused of corruption. Extra judiciary killing or kidnapping is a crime in itself. and it is a bigger crime than simple killing because it is fasaad fil al Ard, the greatest crime.