"Britain was and is ruled by Parliament not Proclamation."
We are talking about where the Unionists stood on Independence, not what happened in Parliament.
They reluctantly accepted a compromise which they had no intention of honouring - quite clear from both their proclamation, which was an open statement of defiance and from the proceedings recorded in Hansard ( 18 months before The Easter Rising).
The Unionists had actually armed themselves against having to accept Independence in any form.
To suggest that The Easter Rising in any way posed the threat of an "unstable state" is utter nonsense; The Unionists had destabilised the situation long before the rising was a twinkle in anyone's eye.
The Easter Rising became an excuse to succumb to the demands of the Unionists.
Partitioning Ireland was utterly undemocratic, even by British Parliamentary standards - a little like allowing South East to secede from the rest of the Britain because that's where the work is.
It is no different to what happened in America when the South attempted to withdraw from The Union - also leading to Civil war.
One of the realities of all this is that in genaral, Northern Irish people in the main consider themselves Irish rather than British - it is the bowler-hatted and be-sashed nutters who are very much in the minority and who cause the bloodshed, not the Northern Irish people.
If you visit any part of the North (East) you will find friendly people who have no problems in communicating with each other - go there on the 'Glorious Twelfth' and you will see how that situation annually changes for a short period (in a couple of cities rather than throughout the country).
Leon Uris and others have rightly described it as "hate-invoking tribalism"      
Jim Carroll