Is it ethical to jump parties to their whims and fancies...

It is true that the UNP lost the Presidential elections where Ranil Wickramasinghe lost by a very small margin in the post election results conducted in Nov 2005. since forming the Govt of President Mahinda Rajapakshe, after lapse of couple of months some UNP ministers was in mind that they should swap the party as the UNP had no future till Ranil Wickramasinghe is the party leader. The Minsiters who switched was Opposition whip Mahinda Samarasighe, Keheliya Rambukwella. Also it is reported that Prof.G.L Peiris too is on the verge of joining the givt with Peace talks on the cards in the next month in Geneva.

Is it ethical for the President to do this unlawful act to take bribe the opposition ministers like that? or is it that they all should join to gether as one team and do the best for the country putting aside the party politics? Since Mahinmda has started to talk peace with the LTTE. and as the govt lacks people who can do this job as the chief negoiator.