The question about Nothern Ireland

Nov 2019
Northern Ireland. List what you think Unionist and Republican leaders have each most feared in trying to negotiate a compromise. What do you think the feared most from their own side?
Sep 2012
London, centre of my world
Welcome to Historum, Veronica.

I assume you mean the political leaders and not the paramilitary ones.

Both sides had plenty of 'volunteers' unfussed about using guns and explosives. Add to this the formation of hard-line splinter groups to carry on the violence, even against their own side, in the event of any compromise (or 'surrender' - a very emotive word in the region).
I would say this was what they feared the most.