"the mass murder of the Easter Week leaders"

Really Jim? Don't really know about the others but Patrick Pearse, Tom Clarke, Thomas MacDonagh and James Connelly knew they were dead the second they decided to go ahead with the rising - they set it up to fail, and they lied to their men and deliberately put them into the field to die - the other leaders knew they were dead the second their names went on that Proclamation.

The leaders of the Easter Week Rising charged under the provisions of the Treason Act had absolutely no defence in law because they undoubtedly had taken up arms against the King and waged war against him in time of war. And all reference to perceived ills and aspirations as viewed by those men you could list till the cows came home, all that is just window dressing, it would not alter the fact that they had indisputably done what they had done and that was what they were charged with and no-one in their right mind was going to allow them to be given a soap box to air their views in a country that was engaged in a life and death struggle against an extremely powerful foe that these man had colluded with. If you scream and shout about Great Britain being an evil Imperial power then you have no right at all to complain or be surprised when she acts in what you perceive to be an evil imperial manner.

3,509 Arrested, about half of whom were released almost immediately;
1,836 Were imprisoned, all released after a year by general amnesty;
90 Convicted and sentenced to death, 75 of them have their sentences commuted to penal servitude and they became part of the 1,836 detailed above;
15 men executed;
66 Volunteers killed in action.

So out of 1,836 who took up arms against the King just under 5% died - That could have been a lot worse.

The population of Dublin was something in the order of about 310,000 people in 1916 and the death toll was 485. Of that number 260 were civilians who the Leaders of the rising deliberately put at risk by staging their armed insurrection in the middle of their city. That means that between the dates given in the thread title 0.08% of the civilian population of Dublin were killed and something like 0.7% were wounded - That too could have been a great deal worse, indeed should have been if all those claims of indiscriminate artillery and machine gun fire are to be given any credence. I wonder how many of them were the 1,000+ inmates of the Mendicity Institute who ranked as the weakest and most vulnerable in the city, who Sean Heuston just turfed out to fend for themselves, or the 3,000+ civilians, patients and charity cases, nurses and doctors who found themselves trapped inside the South Dublin Union when everything kicked off with no opportunity to get clear. Then there were the civilian residents of Moore Street who the Volunteers gave no chance to flee before they entered their homes and took up positions for their last ditch action.