If an odd senior executive makes a shift from one company to another it doesn't change the equation too much for that company....may be a fall in stock price to some extent. But in the political parties which are more or less person dependant tend to create unstability in the government. An unstable political party leads to an unstable governement causing a huge impact to the political balance. As the governement is responsible for the lives of the people the social balance is affected. The two can not be equated
