The Observer view on Peter Mandelson's U-turn on Donald Trump: it's easy to mock, but that's diplomacy | Observer editorialChanging one's mind is seen as maturation in personal circumstances, but in politics, it can signal weakness or embarrassment.
Ellen Coyne: Leaving Coolock protesters out of talks with politicians is only deepening their sense that there is a conspiracy against themPeople's beliefs and opinions can evolve over time in response to changing circumstances and issues.