Assuming a party in power is doing a relatively 'good' job and the economy is good and etc, what is the role of the opposition? Ideally, one would expect the opposition to rally behind the government because it is for the best interest of the country but that doesn't happen. What does happen is the opposition clings onto something that will try to undermine the government (which will not be in the best interest of the country) as they themselves will try to grab hold of power.
Politics is a dirty game.
Politics is a dirty game.