the many reasons Irish (and British) people enlisted

I quoted historians who researched their actual motivation.

the devastating photographs of indiscriminate shelling

There are no such photographs.
The shells were fired directly at the occupied buildings, and at the actual windows from where the rebels were firing.
See the pictures I provided of the Liberty building and YMCA.

Lar Joye, curator of military history at the National Museum of Ireland,
"Most of the damage to Dublin's city centre was caused by fire, particularly at premises like the Irish Times warehouse and Hoyte's Druggists and Oil Works, rather than by shelling."
http://www.historyireland.com/20th-century-contemporary-history/tss-helga-ii/