Northern Ireland isn't allowed to have democracy. Thats the whole point of the GFA: no one ever gets to implement their (inevitably horrific) platform and elections serve as a means of apportioning patronage and public money.
The problem is that Northern Ireland's "democracy" is based on voting for the party that's closest to your religious ideology - if one party ever got a majority, there would be religious tensions again. The closest NI gets to having a democratic vote is in the UK General Election - where their vote doesn't matter.