All for one is an easy enough relationship – everyone is making the same choice of the one they’re for.
One for all? Much harder. All means everyone and it’s very hard to be for everyone. Every person has different needs and wants, even though plenty of people will be broadly similar. I firmly reject the polarising breakdown of society that mainstream media presents, but it is true that when politicians claim to be speaking for ‘the people’ or on behalf of ‘the nation’, they cannot be speaking for everyone.
Perhaps a first step in restoring trust in politics, is to recognise this and stop using language that is expansively grandiose while at the same time very exclusionary.